diff --git a/usermods/user_fx/README.md b/usermods/user_fx/README.md
new file mode 100644
index 0000000000..8dc1d128ef
--- /dev/null
+++ b/usermods/user_fx/README.md
@@ -0,0 +1,4 @@
+# Usermod user FX
+
+This Usermod is a common place to put various user's LED effects.
+
diff --git a/usermods/user_fx/library.json b/usermods/user_fx/library.json
new file mode 100644
index 0000000000..9420eecdff
--- /dev/null
+++ b/usermods/user_fx/library.json
@@ -0,0 +1,3 @@
+{
+  "name": "user_fx"
+}
diff --git a/usermods/user_fx/user_fx.cpp b/usermods/user_fx/user_fx.cpp
new file mode 100644
index 0000000000..7d8fc30808
--- /dev/null
+++ b/usermods/user_fx/user_fx.cpp
@@ -0,0 +1,116 @@
+#include "wled.h"
+
+// for information how FX metadata strings work see https://kno.wled.ge/interfaces/json-api/#effect-metadata
+
+// static effect, used if an effect fails to initialize
+static uint16_t mode_static(void) {
+  SEGMENT.fill(SEGCOLOR(0));
+  return strip.isOffRefreshRequired() ? FRAMETIME : 350;
+}
+
+/////////////////////////
+//  User FX functions  //
+/////////////////////////
+
+// Diffusion Fire: fire effect intended for 2D setups smaller than 16x16
+static uint16_t mode_diffusionfire(void) {
+  if (!strip.isMatrix || !SEGMENT.is2D())
+    return mode_static();  // not a 2D set-up
+
+  const int cols = SEG_W;
+  const int rows = SEG_H;
+  const auto XY = [&](int x, int y) { return x + y * cols; };
+
+  const uint8_t refresh_hz = map(SEGMENT.speed, 0, 255, 20, 80);
+  const unsigned refresh_ms = 1000 / refresh_hz;
+  const int16_t diffusion = map(SEGMENT.custom1, 0, 255, 0, 100);
+  const uint8_t spark_rate = SEGMENT.intensity;
+  const uint8_t turbulence = SEGMENT.custom2;
+
+  unsigned dataSize = SEGMENT.length(); // allocate persistent data for heat value for each pixel
+  if (!SEGENV.allocateData(dataSize))
+    return mode_static();  // allocation failed
+
+  if (SEGENV.call == 0) {
+    SEGMENT.fill(BLACK);
+    SEGENV.step = 0;
+  }
+
+  if ((strip.now - SEGENV.step) >= refresh_ms) {
+    uint8_t tmp_row[cols];
+    SEGENV.step = strip.now;
+    // scroll up
+    for (unsigned y = 1; y < rows; y++)
+      for (unsigned x = 0; x < cols; x++) {
+        unsigned src = XY(x, y);
+        unsigned dst = XY(x, y - 1);
+        SEGMENT.data[dst] = SEGMENT.data[src];
+      }
+
+    if (hw_random8() > turbulence) {
+      // create new sparks at bottom row
+      for (unsigned x = 0; x < cols; x++) {
+        uint8_t p = hw_random8();
+        if (p < spark_rate) {
+          unsigned dst = XY(x, rows - 1);
+          SEGMENT.data[dst] = 255;
+        }
+      }
+    }
+
+    // diffuse
+    for (unsigned y = 0; y < rows; y++) {
+      for (unsigned x = 0; x < cols; x++) {
+        unsigned v = SEGMENT.data[XY(x, y)];
+        if (x > 0) {
+          v += SEGMENT.data[XY(x - 1, y)];
+        }
+        if (x < (cols - 1)) {
+          v += SEGMENT.data[XY(x + 1, y)];
+        }
+        tmp_row[x] = min(255, (int)(v * 100 / (300 + diffusion)));
+      }
+
+      for (unsigned x = 0; x < cols; x++) {
+        SEGMENT.data[XY(x, y)] = tmp_row[x];
+        if (SEGMENT.check1) {
+          uint32_t color = ColorFromPalette(SEGPALETTE, tmp_row[x], 255, LINEARBLEND_NOWRAP);
+          SEGMENT.setPixelColorXY(x, y, color);
+        } else {
+          uint32_t color = SEGCOLOR(0);
+          SEGMENT.setPixelColorXY(x, y, color_fade(color, tmp_row[x]));
+        }
+      }
+    }
+  }
+  return FRAMETIME;
+}
+static const char _data_FX_MODE_DIFFUSIONFIRE[] PROGMEM = "Diffusion Fire@!,Spark rate,Diffusion Speed,Turbulence,,Use palette;;Color;;2;pal=35";
+
+
+/////////////////////
+//  UserMod Class  //
+/////////////////////
+
+class UserFxUsermod : public Usermod {
+ private:
+ public:
+  void setup() override {
+    strip.addEffect(255, &mode_diffusionfire, _data_FX_MODE_DIFFUSIONFIRE);
+
+    ////////////////////////////////////////
+    //  add your effect function(s) here  //
+    ////////////////////////////////////////
+
+    // use id=255 for all custom user FX (the final id is assigned when adding the effect)
+
+    // strip.addEffect(255, &mode_your_effect, _data_FX_MODE_YOUR_EFFECT);
+    // strip.addEffect(255, &mode_your_effect2, _data_FX_MODE_YOUR_EFFECT2);
+    // strip.addEffect(255, &mode_your_effect3, _data_FX_MODE_YOUR_EFFECT3);
+  }
+  void loop() override {} // nothing to do in the loop
+  uint16_t getId() override { return USERMOD_ID_USER_FX; }
+};
+
+static UserFxUsermod user_fx;
+REGISTER_USERMOD(user_fx);
diff --git a/wled00/const.h b/wled00/const.h
index 2b460f3f18..2305eb6a79 100644
--- a/wled00/const.h
+++ b/wled00/const.h
@@ -210,6 +210,7 @@
 #define USERMOD_ID_DEEP_SLEEP            55     //Usermod "usermod_deep_sleep.h"
 #define USERMOD_ID_RF433                 56     //Usermod "usermod_v2_RF433.h"
 #define USERMOD_ID_BRIGHTNESS_FOLLOW_SUN 57     //Usermod "usermod_v2_brightness_follow_sun.h"
+#define USERMOD_ID_USER_FX               58     //Usermod "user_fx"
 
 //Access point behavior
 #define AP_BEHAVIOR_BOOT_NO_CONN          0     //Open AP when no connection after boot