diff --git a/packages/core/src/textures/resources/ImageResource.js b/packages/core/src/textures/resources/ImageResource.js
index ce552a8..f457f55 100644
--- a/packages/core/src/textures/resources/ImageResource.js
+++ b/packages/core/src/textures/resources/ImageResource.js
@@ -33,6 +33,16 @@
 
         super(source);
 
+        // FireFox 68, and possibly other versions, seems like setting the HTMLImageElement#width and #height
+        // to non-zero values before its loading completes if images are in a cache.
+        // Because of this, need to set the `_width` and the `_height` to zero to avoid uploading incomplete images.
+        // Please refer to the issue #5968 (https://github.com/pixijs/pixi.js/issues/5968).
+        if (!source.complete && !!this._width && !!this._height)
+        {
+            this._width = 0;
+            this._height = 0;
+        }
+
         /**
          * URL of the image source
          * @member {string}