diff --git a/lib/cjs/generated/browserSessionReplay.d.ts b/lib/cjs/generated/browserSessionReplay.d.ts
index fbfad6e6..9d6c2da9 100644
--- a/lib/cjs/generated/browserSessionReplay.d.ts
+++ b/lib/cjs/generated/browserSessionReplay.d.ts
@@ -84,9 +84,9 @@ export type SnapshotFormatChange = 1;
 /**
  * Browser-specific. Schema representing an individual change within a BrowserChangeData collection.
  */
-export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]];
+export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]] | [11, ...AddStringNamespaceChange[]] | [12, ...AddNamespacedStringChange[]];
 /**
- * Browser-specific. Schema representing the addition of a string to the string table.
+ * Browser-specific. Schema representing the addition of a string to the default string namespace.
  */
 export type AddStringChange = string;
 /**
@@ -136,9 +136,25 @@ export type AddDocTypeNodeChange = [
     StringOrStringReference
 ];
 /**
- * Browser-specific. Schema representing a string, either expressed as a literal or as an index into the string table.
+ * Browser-specific. Schema representing a string, either expressed as a literal, as a literal with an associated string namespace, or as an index into the string table.
  */
-export type StringOrStringReference = string | StringReference;
+export type StringOrStringReference = StringLiteral | NamespacedStringLiteral | StringReference;
+/**
+ * Browser-specific. Schema representing a string, expressed as a literal.
+ */
+export type StringLiteral = string;
+/**
+ * Browser-specific. Schema representing a string namespace, either expressed as a literal name or as a numeric reference.
+ */
+export type StringNamespaceOrStringNamespaceReference = StringNamespaceName | StringNamespaceReference;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a literal name.
+ */
+export type StringNamespaceName = string;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a numeric reference. The reference 0 refers to the default string namespace; higher values refer to each additional string namespace, in the order they were created.
+ */
+export type StringNamespaceReference = number;
 /**
  * Schema representing the addition of a new #document node.
  *
@@ -303,6 +319,16 @@ export type VisualViewportHeight = number;
  * The pinch-zoom scaling factor applied to the visual viewport.
  */
 export type VisualViewportScale = number;
+/**
+ * Browser-specific. Schema representing the addition of a new string namespace, identified by name.
+ */
+export type AddStringNamespaceChange = StringNamespaceName;
+/**
+ * Browser-specific. Schema representing the addition of a sequence of strings to a string namespace.
+ *
+ * @minItems 1
+ */
+export type AddNamespacedStringChange = [StringNamespaceOrStringNamespaceReference, ...StringLiteral[]];
 /**
  * Browser-specific. Schema of a Record type which contains mutations of a screen.
  */
@@ -764,6 +790,13 @@ export interface CDataNode {
     readonly type: 4;
     textContent: '';
 }
+/**
+ * Browser-specific. Schema representing a string literal with an associated string namespace.
+ */
+export interface NamespacedStringLiteral {
+    namespace: StringNamespaceOrStringNamespaceReference;
+    string: StringLiteral;
+}
 /**
  * Schema of an AddedNodeMutation.
  */
diff --git a/lib/cjs/generated/sessionReplay.d.ts b/lib/cjs/generated/sessionReplay.d.ts
index f00c0080..4424cbcd 100644
--- a/lib/cjs/generated/sessionReplay.d.ts
+++ b/lib/cjs/generated/sessionReplay.d.ts
@@ -92,9 +92,9 @@ export type SnapshotFormatChange = 1;
 /**
  * Browser-specific. Schema representing an individual change within a BrowserChangeData collection.
  */
-export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]];
+export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]] | [11, ...AddStringNamespaceChange[]] | [12, ...AddNamespacedStringChange[]];
 /**
- * Browser-specific. Schema representing the addition of a string to the string table.
+ * Browser-specific. Schema representing the addition of a string to the default string namespace.
  */
 export type AddStringChange = string;
 /**
@@ -144,9 +144,25 @@ export type AddDocTypeNodeChange = [
     StringOrStringReference
 ];
 /**
- * Browser-specific. Schema representing a string, either expressed as a literal or as an index into the string table.
+ * Browser-specific. Schema representing a string, either expressed as a literal, as a literal with an associated string namespace, or as an index into the string table.
  */
-export type StringOrStringReference = string | StringReference;
+export type StringOrStringReference = StringLiteral | NamespacedStringLiteral | StringReference;
+/**
+ * Browser-specific. Schema representing a string, expressed as a literal.
+ */
+export type StringLiteral = string;
+/**
+ * Browser-specific. Schema representing a string namespace, either expressed as a literal name or as a numeric reference.
+ */
+export type StringNamespaceOrStringNamespaceReference = StringNamespaceName | StringNamespaceReference;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a literal name.
+ */
+export type StringNamespaceName = string;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a numeric reference. The reference 0 refers to the default string namespace; higher values refer to each additional string namespace, in the order they were created.
+ */
+export type StringNamespaceReference = number;
 /**
  * Schema representing the addition of a new #document node.
  *
@@ -311,6 +327,16 @@ export type VisualViewportHeight = number;
  * The pinch-zoom scaling factor applied to the visual viewport.
  */
 export type VisualViewportScale = number;
+/**
+ * Browser-specific. Schema representing the addition of a new string namespace, identified by name.
+ */
+export type AddStringNamespaceChange = StringNamespaceName;
+/**
+ * Browser-specific. Schema representing the addition of a sequence of strings to a string namespace.
+ *
+ * @minItems 1
+ */
+export type AddNamespacedStringChange = [StringNamespaceOrStringNamespaceReference, ...StringLiteral[]];
 /**
  * Browser-specific. Schema of a Record type which contains mutations of a screen.
  */
@@ -1233,6 +1259,13 @@ export interface CDataNode {
     readonly type: 4;
     textContent: '';
 }
+/**
+ * Browser-specific. Schema representing a string literal with an associated string namespace.
+ */
+export interface NamespacedStringLiteral {
+    namespace: StringNamespaceOrStringNamespaceReference;
+    string: StringLiteral;
+}
 /**
  * Schema of an AddedNodeMutation.
  */
diff --git a/lib/cjs/src/session-replay-browser.d.ts b/lib/cjs/src/session-replay-browser.d.ts
index 17e16d4d..aba97abf 100644
--- a/lib/cjs/src/session-replay-browser.d.ts
+++ b/lib/cjs/src/session-replay-browser.d.ts
@@ -70,6 +70,8 @@ export declare const ChangeType: {
     AttachedStyleSheets: ChangeTypeId<8, SessionReplay.AttachedStyleSheetsChange>;
     MediaPlaybackState: ChangeTypeId<9, SessionReplay.MediaPlaybackStateChange>;
     VisualViewport: ChangeTypeId<10, SessionReplay.VisualViewportChange>;
+    AddStringNamespace: ChangeTypeId<11, SessionReplay.AddStringNamespaceChange>;
+    AddNamespacedString: ChangeTypeId<12, SessionReplay.AddNamespacedStringChange>;
 };
 export type ChangeType = (typeof ChangeType)[keyof typeof ChangeType];
 export declare const PlaybackState: {
diff --git a/lib/cjs/src/session-replay-browser.js b/lib/cjs/src/session-replay-browser.js
index 6b067197..f54c429d 100644
--- a/lib/cjs/src/session-replay-browser.js
+++ b/lib/cjs/src/session-replay-browser.js
@@ -80,6 +80,8 @@ exports.ChangeType = {
     AttachedStyleSheets: 8,
     MediaPlaybackState: 9,
     VisualViewport: 10,
+    AddStringNamespace: 11,
+    AddNamespacedString: 12,
 };
 exports.PlaybackState = {
     Playing: 0,
diff --git a/lib/cjs/src/session-replay.d.ts b/lib/cjs/src/session-replay.d.ts
index c71d0256..581a2bd1 100644
--- a/lib/cjs/src/session-replay.d.ts
+++ b/lib/cjs/src/session-replay.d.ts
@@ -35,6 +35,9 @@ export type NodeId = number & {
 export type StringId = number & {
     __brand: 'StringId';
 };
+export type StringNamespaceId = number & {
+    __brand: 'StringNamespaceId';
+};
 export type StyleSheetId = number & {
     __brand: 'StyleSheetId';
 };
diff --git a/lib/esm/generated/browserSessionReplay.d.ts b/lib/esm/generated/browserSessionReplay.d.ts
index fbfad6e6..9d6c2da9 100644
--- a/lib/esm/generated/browserSessionReplay.d.ts
+++ b/lib/esm/generated/browserSessionReplay.d.ts
@@ -84,9 +84,9 @@ export type SnapshotFormatChange = 1;
 /**
  * Browser-specific. Schema representing an individual change within a BrowserChangeData collection.
  */
-export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]];
+export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]] | [11, ...AddStringNamespaceChange[]] | [12, ...AddNamespacedStringChange[]];
 /**
- * Browser-specific. Schema representing the addition of a string to the string table.
+ * Browser-specific. Schema representing the addition of a string to the default string namespace.
  */
 export type AddStringChange = string;
 /**
@@ -136,9 +136,25 @@ export type AddDocTypeNodeChange = [
     StringOrStringReference
 ];
 /**
- * Browser-specific. Schema representing a string, either expressed as a literal or as an index into the string table.
+ * Browser-specific. Schema representing a string, either expressed as a literal, as a literal with an associated string namespace, or as an index into the string table.
  */
-export type StringOrStringReference = string | StringReference;
+export type StringOrStringReference = StringLiteral | NamespacedStringLiteral | StringReference;
+/**
+ * Browser-specific. Schema representing a string, expressed as a literal.
+ */
+export type StringLiteral = string;
+/**
+ * Browser-specific. Schema representing a string namespace, either expressed as a literal name or as a numeric reference.
+ */
+export type StringNamespaceOrStringNamespaceReference = StringNamespaceName | StringNamespaceReference;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a literal name.
+ */
+export type StringNamespaceName = string;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a numeric reference. The reference 0 refers to the default string namespace; higher values refer to each additional string namespace, in the order they were created.
+ */
+export type StringNamespaceReference = number;
 /**
  * Schema representing the addition of a new #document node.
  *
@@ -303,6 +319,16 @@ export type VisualViewportHeight = number;
  * The pinch-zoom scaling factor applied to the visual viewport.
  */
 export type VisualViewportScale = number;
+/**
+ * Browser-specific. Schema representing the addition of a new string namespace, identified by name.
+ */
+export type AddStringNamespaceChange = StringNamespaceName;
+/**
+ * Browser-specific. Schema representing the addition of a sequence of strings to a string namespace.
+ *
+ * @minItems 1
+ */
+export type AddNamespacedStringChange = [StringNamespaceOrStringNamespaceReference, ...StringLiteral[]];
 /**
  * Browser-specific. Schema of a Record type which contains mutations of a screen.
  */
@@ -764,6 +790,13 @@ export interface CDataNode {
     readonly type: 4;
     textContent: '';
 }
+/**
+ * Browser-specific. Schema representing a string literal with an associated string namespace.
+ */
+export interface NamespacedStringLiteral {
+    namespace: StringNamespaceOrStringNamespaceReference;
+    string: StringLiteral;
+}
 /**
  * Schema of an AddedNodeMutation.
  */
diff --git a/lib/esm/generated/sessionReplay.d.ts b/lib/esm/generated/sessionReplay.d.ts
index f00c0080..4424cbcd 100644
--- a/lib/esm/generated/sessionReplay.d.ts
+++ b/lib/esm/generated/sessionReplay.d.ts
@@ -92,9 +92,9 @@ export type SnapshotFormatChange = 1;
 /**
  * Browser-specific. Schema representing an individual change within a BrowserChangeData collection.
  */
-export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]];
+export type Change = [0, ...AddStringChange[]] | [1, ...AddNodeChange[]] | [2, ...RemoveNodeChange[]] | [3, ...AttributeChange[]] | [4, ...TextChange[]] | [5, ...SizeChange[]] | [6, ...ScrollPositionChange[]] | [7, ...AddStyleSheetChange[]] | [8, ...AttachedStyleSheetsChange[]] | [9, ...MediaPlaybackStateChange[]] | [10, ...VisualViewportChange[]] | [11, ...AddStringNamespaceChange[]] | [12, ...AddNamespacedStringChange[]];
 /**
- * Browser-specific. Schema representing the addition of a string to the string table.
+ * Browser-specific. Schema representing the addition of a string to the default string namespace.
  */
 export type AddStringChange = string;
 /**
@@ -144,9 +144,25 @@ export type AddDocTypeNodeChange = [
     StringOrStringReference
 ];
 /**
- * Browser-specific. Schema representing a string, either expressed as a literal or as an index into the string table.
+ * Browser-specific. Schema representing a string, either expressed as a literal, as a literal with an associated string namespace, or as an index into the string table.
  */
-export type StringOrStringReference = string | StringReference;
+export type StringOrStringReference = StringLiteral | NamespacedStringLiteral | StringReference;
+/**
+ * Browser-specific. Schema representing a string, expressed as a literal.
+ */
+export type StringLiteral = string;
+/**
+ * Browser-specific. Schema representing a string namespace, either expressed as a literal name or as a numeric reference.
+ */
+export type StringNamespaceOrStringNamespaceReference = StringNamespaceName | StringNamespaceReference;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a literal name.
+ */
+export type StringNamespaceName = string;
+/**
+ * Browser-specific. Schema representing a string namespace, expressed as a numeric reference. The reference 0 refers to the default string namespace; higher values refer to each additional string namespace, in the order they were created.
+ */
+export type StringNamespaceReference = number;
 /**
  * Schema representing the addition of a new #document node.
  *
@@ -311,6 +327,16 @@ export type VisualViewportHeight = number;
  * The pinch-zoom scaling factor applied to the visual viewport.
  */
 export type VisualViewportScale = number;
+/**
+ * Browser-specific. Schema representing the addition of a new string namespace, identified by name.
+ */
+export type AddStringNamespaceChange = StringNamespaceName;
+/**
+ * Browser-specific. Schema representing the addition of a sequence of strings to a string namespace.
+ *
+ * @minItems 1
+ */
+export type AddNamespacedStringChange = [StringNamespaceOrStringNamespaceReference, ...StringLiteral[]];
 /**
  * Browser-specific. Schema of a Record type which contains mutations of a screen.
  */
@@ -1233,6 +1259,13 @@ export interface CDataNode {
     readonly type: 4;
     textContent: '';
 }
+/**
+ * Browser-specific. Schema representing a string literal with an associated string namespace.
+ */
+export interface NamespacedStringLiteral {
+    namespace: StringNamespaceOrStringNamespaceReference;
+    string: StringLiteral;
+}
 /**
  * Schema of an AddedNodeMutation.
  */
diff --git a/lib/esm/src/session-replay-browser.d.ts b/lib/esm/src/session-replay-browser.d.ts
index 17e16d4d..aba97abf 100644
--- a/lib/esm/src/session-replay-browser.d.ts
+++ b/lib/esm/src/session-replay-browser.d.ts
@@ -70,6 +70,8 @@ export declare const ChangeType: {
     AttachedStyleSheets: ChangeTypeId<8, SessionReplay.AttachedStyleSheetsChange>;
     MediaPlaybackState: ChangeTypeId<9, SessionReplay.MediaPlaybackStateChange>;
     VisualViewport: ChangeTypeId<10, SessionReplay.VisualViewportChange>;
+    AddStringNamespace: ChangeTypeId<11, SessionReplay.AddStringNamespaceChange>;
+    AddNamespacedString: ChangeTypeId<12, SessionReplay.AddNamespacedStringChange>;
 };
 export type ChangeType = (typeof ChangeType)[keyof typeof ChangeType];
 export declare const PlaybackState: {
diff --git a/lib/esm/src/session-replay-browser.js b/lib/esm/src/session-replay-browser.js
index 37725a37..234193f8 100644
--- a/lib/esm/src/session-replay-browser.js
+++ b/lib/esm/src/session-replay-browser.js
@@ -63,6 +63,8 @@ export var ChangeType = {
     AttachedStyleSheets: 8,
     MediaPlaybackState: 9,
     VisualViewport: 10,
+    AddStringNamespace: 11,
+    AddNamespacedString: 12,
 };
 export var PlaybackState = {
     Playing: 0,
diff --git a/lib/esm/src/session-replay.d.ts b/lib/esm/src/session-replay.d.ts
index c71d0256..581a2bd1 100644
--- a/lib/esm/src/session-replay.d.ts
+++ b/lib/esm/src/session-replay.d.ts
@@ -35,6 +35,9 @@ export type NodeId = number & {
 export type StringId = number & {
     __brand: 'StringId';
 };
+export type StringNamespaceId = number & {
+    __brand: 'StringNamespaceId';
+};
 export type StyleSheetId = number & {
     __brand: 'StyleSheetId';
 };
diff --git a/lib/src/session-replay-browser.ts b/lib/src/session-replay-browser.ts
index 95fe8685..97484371 100644
--- a/lib/src/session-replay-browser.ts
+++ b/lib/src/session-replay-browser.ts
@@ -115,6 +115,8 @@ export const ChangeType: {
   AttachedStyleSheets: ChangeTypeId<8, SessionReplay.AttachedStyleSheetsChange>
   MediaPlaybackState: ChangeTypeId<9, SessionReplay.MediaPlaybackStateChange>
   VisualViewport: ChangeTypeId<10, SessionReplay.VisualViewportChange>
+  AddStringNamespace: ChangeTypeId<11, SessionReplay.AddStringNamespaceChange>
+  AddNamespacedString: ChangeTypeId<12, SessionReplay.AddNamespacedStringChange>
 } = {
   AddString: 0,
   AddNode: 1,
@@ -127,6 +129,8 @@ export const ChangeType: {
   AttachedStyleSheets: 8,
   MediaPlaybackState: 9,
   VisualViewport: 10,
+  AddStringNamespace: 11,
+  AddNamespacedString: 12,
 } as const
 
 export type ChangeType = (typeof ChangeType)[keyof typeof ChangeType]
diff --git a/lib/src/session-replay.ts b/lib/src/session-replay.ts
index 3de40d89..13d3ef6a 100644
--- a/lib/src/session-replay.ts
+++ b/lib/src/session-replay.ts
@@ -72,4 +72,5 @@ export type PointerType = (typeof PointerType)[keyof typeof PointerType]
 
 export type NodeId = number & { __brand: 'NodeId' }
 export type StringId = number & { __brand: 'StringId' }
+export type StringNamespaceId = number & { __brand: 'StringNamespaceId' }
 export type StyleSheetId = number & { __brand: 'StyleSheetId' }
diff --git a/samples/session-replay/browser/record/change-record.json b/samples/session-replay/browser/record/change-record.json
index 24130c78..83a24605 100644
--- a/samples/session-replay/browser/record/change-record.json
+++ b/samples/session-replay/browser/record/change-record.json
@@ -79,6 +79,13 @@
     [8, [11, 0, 1]],
     [9, [15, 0]],
     [9, [15, 1]],
-    [10, [30, 30, 15, 15, 1024, 768, 2]]
+    [10, [30, 30, 15, 15, 1024, 768, 2]],
+    [11, "dom", "css", "user-text"],
+    [11, "svg"],
+    [12, ["dom", "div", "span"], ["css", "div { color: blue }"], ["user-text", "Hello"]],
+    [12, [1, "div", "span"], [2, "div { color: blue }"], [3, "Hello"]],
+    [12, [4, "circle"]],
+    [4, [6, { "namespace": "user-text", "string": "Goodbye" }]],
+    [4, [6, { "namespace": 3, "string": "Goodbye" }]]
   ]
 }
diff --git a/samples/session-replay/browser/record/full-snapshot-change-record.json b/samples/session-replay/browser/record/full-snapshot-change-record.json
index a8126141..af509132 100644
--- a/samples/session-replay/browser/record/full-snapshot-change-record.json
+++ b/samples/session-replay/browser/record/full-snapshot-change-record.json
@@ -80,6 +80,13 @@
     [8, [11, 0, 1]],
     [9, [15, 0]],
     [9, [15, 1]],
-    [10, [30, 30, 15, 15, 1024, 768, 2]]
+    [10, [30, 30, 15, 15, 1024, 768, 2]],
+    [11, "dom", "css", "user-text"],
+    [11, "svg"],
+    [12, ["dom", "div", "span"], ["css", "div { color: blue }"], ["user-text", "Hello"]],
+    [12, [1, "div", "span"], [2, "div { color: blue }"], [3, "Hello"]],
+    [12, [4, "circle"]],
+    [4, [6, { "namespace": "user-text", "string": "Goodbye" }]],
+    [4, [6, { "namespace": 3, "string": "Goodbye" }]]
   ]
 }
diff --git a/schemas/session-replay/browser/changes/add-namespaced-string-change-schema.json b/schemas/session-replay/browser/changes/add-namespaced-string-change-schema.json
new file mode 100644
index 00000000..749e9fc0
--- /dev/null
+++ b/schemas/session-replay/browser/changes/add-namespaced-string-change-schema.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/add-namespaced-string-change-schema.json",
+  "title": "AddNamespacedStringChange",
+  "description": "Browser-specific. Schema representing the addition of a sequence of strings to a string namespace.",
+  "type": "array",
+  "minItems": 1,
+  "items": [{ "$ref": "string-references/string-namespace-or-string-namespace-reference-schema.json" }],
+  "additionalItems": { "$ref": "string-references/string-literal-schema.json" }
+}
diff --git a/schemas/session-replay/browser/changes/add-string-change-schema.json b/schemas/session-replay/browser/changes/add-string-change-schema.json
index 13c88836..103e9c75 100644
--- a/schemas/session-replay/browser/changes/add-string-change-schema.json
+++ b/schemas/session-replay/browser/changes/add-string-change-schema.json
@@ -2,6 +2,6 @@
   "$schema": "http://json-schema.org/draft-07/schema",
   "$id": "session-replay/browser/changes/add-string-change-schema.json",
   "title": "AddStringChange",
-  "description": "Browser-specific. Schema representing the addition of a string to the string table.",
+  "description": "Browser-specific. Schema representing the addition of a string to the default string namespace.",
   "type": "string"
 }
diff --git a/schemas/session-replay/browser/changes/add-string-namespace-change-schema.json b/schemas/session-replay/browser/changes/add-string-namespace-change-schema.json
new file mode 100644
index 00000000..5bce9093
--- /dev/null
+++ b/schemas/session-replay/browser/changes/add-string-namespace-change-schema.json
@@ -0,0 +1,7 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/add-string-namespace-change-schema.json",
+  "title": "AddStringNamespaceChange",
+  "description": "Browser-specific. Schema representing the addition of a new string namespace, identified by name.",
+  "allOf": [{ "$ref": "string-references/string-namespace-name-schema.json" }]
+}
diff --git a/schemas/session-replay/browser/changes/change-schema.json b/schemas/session-replay/browser/changes/change-schema.json
index d9cdc134..dfe96486 100644
--- a/schemas/session-replay/browser/changes/change-schema.json
+++ b/schemas/session-replay/browser/changes/change-schema.json
@@ -80,6 +80,20 @@
       "items": [{ "const": 10 }],
       "additionalItems": { "$ref": "visual-viewport-change-schema.json" },
       "description": "Changes to the visual viewport."
+    },
+    {
+      "type": "array",
+      "minItems": 1,
+      "items": [{ "const": 11 }],
+      "additionalItems": { "$ref": "add-string-namespace-change-schema.json" },
+      "description": "Newly added string namespaces."
+    },
+    {
+      "type": "array",
+      "minItems": 1,
+      "items": [{ "const": 12 }],
+      "additionalItems": { "$ref": "add-namespaced-string-change-schema.json" },
+      "description": "Newly added namespaced strings."
     }
   ]
 }
diff --git a/schemas/session-replay/browser/changes/string-references/namespaced-string-literal-schema.json b/schemas/session-replay/browser/changes/string-references/namespaced-string-literal-schema.json
new file mode 100644
index 00000000..843db03e
--- /dev/null
+++ b/schemas/session-replay/browser/changes/string-references/namespaced-string-literal-schema.json
@@ -0,0 +1,13 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/string-references/namespaced-string-literal-schema.json",
+  "title": "NamespacedStringLiteral",
+  "description": "Browser-specific. Schema representing a string literal with an associated string namespace.",
+  "type": "object",
+  "required": ["namespace", "string"],
+  "properties": {
+    "namespace": { "$ref": "string-namespace-or-string-namespace-reference-schema.json" },
+    "string": { "$ref": "string-literal-schema.json" }
+  },
+  "additionalProperties": false
+}
diff --git a/schemas/session-replay/browser/changes/string-references/string-literal-schema.json b/schemas/session-replay/browser/changes/string-references/string-literal-schema.json
new file mode 100644
index 00000000..c520cfbc
--- /dev/null
+++ b/schemas/session-replay/browser/changes/string-references/string-literal-schema.json
@@ -0,0 +1,7 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/string-references/string-literal-schema.json",
+  "title": "StringLiteral",
+  "description": "Browser-specific. Schema representing a string, expressed as a literal.",
+  "type": "string"
+}
diff --git a/schemas/session-replay/browser/changes/string-references/string-namespace-name-schema.json b/schemas/session-replay/browser/changes/string-references/string-namespace-name-schema.json
new file mode 100644
index 00000000..14dbdc59
--- /dev/null
+++ b/schemas/session-replay/browser/changes/string-references/string-namespace-name-schema.json
@@ -0,0 +1,7 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/string-references/string-namespace-name-schema.json",
+  "title": "StringNamespaceName",
+  "description": "Browser-specific. Schema representing a string namespace, expressed as a literal name.",
+  "type": "string"
+}
diff --git a/schemas/session-replay/browser/changes/string-references/string-namespace-or-string-namespace-reference-schema.json b/schemas/session-replay/browser/changes/string-references/string-namespace-or-string-namespace-reference-schema.json
new file mode 100644
index 00000000..c97b0b22
--- /dev/null
+++ b/schemas/session-replay/browser/changes/string-references/string-namespace-or-string-namespace-reference-schema.json
@@ -0,0 +1,7 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/string-references/string-namespace-or-string-namespace-reference-schema.json",
+  "title": "StringNamespaceOrStringNamespaceReference",
+  "description": "Browser-specific. Schema representing a string namespace, either expressed as a literal name or as a numeric reference.",
+  "oneOf": [{ "$ref": "string-namespace-name-schema.json" }, { "$ref": "string-namespace-reference-schema.json" }]
+}
diff --git a/schemas/session-replay/browser/changes/string-references/string-namespace-reference-schema.json b/schemas/session-replay/browser/changes/string-references/string-namespace-reference-schema.json
new file mode 100644
index 00000000..1e8b28d8
--- /dev/null
+++ b/schemas/session-replay/browser/changes/string-references/string-namespace-reference-schema.json
@@ -0,0 +1,8 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "session-replay/browser/changes/string-references/string-namespace-reference-schema.json",
+  "title": "StringNamespaceReference",
+  "description": "Browser-specific. Schema representing a string namespace, expressed as a numeric reference. The reference 0 refers to the default string namespace; higher values refer to each additional string namespace, in the order they were created.",
+  "type": "integer",
+  "minimum": 0
+}
diff --git a/schemas/session-replay/browser/changes/string-references/string-or-string-reference-schema.json b/schemas/session-replay/browser/changes/string-references/string-or-string-reference-schema.json
index 89aa9543..7a7b7d16 100644
--- a/schemas/session-replay/browser/changes/string-references/string-or-string-reference-schema.json
+++ b/schemas/session-replay/browser/changes/string-references/string-or-string-reference-schema.json
@@ -2,12 +2,10 @@
   "$schema": "http://json-schema.org/draft-07/schema",
   "$id": "session-replay/browser/changes/string-references/string-or-string-reference-schema.json",
   "title": "StringOrStringReference",
-  "description": "Browser-specific. Schema representing a string, either expressed as a literal or as an index into the string table.",
+  "description": "Browser-specific. Schema representing a string, either expressed as a literal, as a literal with an associated string namespace, or as an index into the string table.",
   "oneOf": [
-    {
-      "type": "string",
-      "description": "A literal string."
-    },
+    { "$ref": "string-literal-schema.json" },
+    { "$ref": "namespaced-string-literal-schema.json" },
     { "$ref": "string-reference-schema.json" }
   ]
 }