diff --git a/css/properties/border-right.json b/css/properties/border-right.json
index 1d6c7e86d6e4c0..f36260abc3b8d8 100644
--- a/css/properties/border-right.json
+++ b/css/properties/border-right.json
@@ -19,9 +19,7 @@
             "firefox": {
               "version_added": "1"
             },
-            "firefox_android": {
-              "version_added": "14"
-            },
+            "firefox_android": "mirror",
             "ie": {
               "version_added": "5.5"
             },
@@ -58,9 +56,7 @@
               "firefox": {
                 "version_added": "1.5"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "ie": {
                 "version_added": "9"
               },
@@ -103,9 +99,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -141,9 +135,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -179,9 +171,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -217,9 +207,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -255,9 +243,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -293,9 +279,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -331,9 +315,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -369,9 +351,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -407,9 +387,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -445,9 +423,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -483,9 +459,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -521,9 +495,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -559,9 +531,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",
@@ -597,9 +567,7 @@
               "firefox": {
                 "version_added": "1"
               },
-              "firefox_android": {
-                "version_added": "14"
-              },
+              "firefox_android": "mirror",
               "oculus": "mirror",
               "opera": "mirror",
               "opera_android": "mirror",