diff --git a/src/core/platform.js b/src/core/platform.js
index 33d61b8705f..fb708b73af2 100644
--- a/src/core/platform.js
+++ b/src/core/platform.js
@@ -52,6 +52,15 @@ const passiveEvents = detectPassiveEvents();
  * }
  */
 const platform = {
+    /**
+     * String identifying the current platform. Can be one of: android, ios, windows, osx, linux,
+     * cros or null.
+     *
+     * @type {'android' | 'ios' | 'windows' | 'osx' | 'linux' | 'cros' | null}
+     * @ignore
+     */
+    name: platformName,
+
     /**
      * String identifying the current runtime environment. Either 'browser' or 'node'.
      *
diff --git a/src/platform/graphics/webgl/webgl-graphics-device.js b/src/platform/graphics/webgl/webgl-graphics-device.js
index 48456777d80..3858f3e4d6e 100644
--- a/src/platform/graphics/webgl/webgl-graphics-device.js
+++ b/src/platform/graphics/webgl/webgl-graphics-device.js
@@ -354,6 +354,20 @@ class WebglGraphicsDevice extends GraphicsDevice {
             Debug.log("Antialiasing has been turned off due to rendering issues on AppleWebKit 15.4");
         }
 
+        // #5856 - turn off antialiasing on Windows Firefox
+        if (platform.browserName === 'firefox' && platform.name === 'windows') {
+            const ua = (typeof navigator !== 'undefined') ? navigator.userAgent : '';
+            const match = ua.match(/Firefox\/(\d+(\.\d+)*)/);
+            const firefoxVersion = match ? match[1] : null;
+            if (firefoxVersion) {
+                const version = parseFloat(firefoxVersion);
+                if (version >= 120 || version === 115) {
+                    options.antialias = false;
+                    Debug.log("Antialiasing has been turned off due to rendering issues on Windows Firefox esr115 and 120+. Current version: " + firefoxVersion);
+                }
+            }
+        }
+
         let gl = null;
 
         // we always allocate the default framebuffer without antialiasing, so remove that option