hotfix: ignore foreign stylesheets (ff)

Author: drinking-code

package.json

@@ -1,6 +1,6 @@
 {
     "name": "react-round-div",
-    "version": "1.2.0",
+    "version": "1.2.1",
     "description": "Make your rounded corners look phenomenal with g2 continuity.",
     "main": "dist/main.js",
     "scripts": {

src/external/getMatchedCSSRules-polyfill.js

@@ -38,7 +38,13 @@ if (typeof window !== 'undefined' && typeof window.getMatchedCSSRules !== 'funct
         // if this sheet's media is specified and doesn't match the viewport then skip it
         if (sheet_media && sheet_media.length && !window.matchMedia(sheet_media).matches) return [];
         // get the style rules of this sheet
-        return toArray(stylesheet.cssRules);
+        try {
+            // modification to original (try statement):
+            // firefox doesn't allow accessing "cssRules" of foreign stylesheets => just return empty array
+            return toArray(stylesheet.cssRules);
+        } catch (e) {
+            return [];
+        }
     }
 
     function _find(string, re) {