diff --git a/modules/angular2/src/test_lib/utils.ts b/modules/angular2/src/test_lib/utils.ts
index 50d2a1793e..281c818a52 100644
--- a/modules/angular2/src/test_lib/utils.ts
+++ b/modules/angular2/src/test_lib/utils.ts
@@ -88,7 +88,8 @@ export function normalizeCSS(css: string): string {
   css = StringWrapper.replaceAll(css, /:\s/g, ':');
   css = StringWrapper.replaceAll(css, /'/g, '"');
   css = StringWrapper.replaceAll(css, / }/g, '}');
-  css = StringWrapper.replaceAllMapped(css, /url\(\"(.+)\\"\)/g, (match) => `url(${match[1]})`);
+  css = StringWrapper.replaceAllMapped(css, /url\((\"|\s)(.+)(\"|\s)\)(\s*)/g,
+                                       (match) => `url("${match[2]}")`);
   css = StringWrapper.replaceAllMapped(css, /\[(.+)=([^"\]]+)\]/g,
                                        (match) => `[${match[1]}="${match[2]}"]`);
   return css;
diff --git a/modules/angular2/test/core/compiler/shadow_css_spec.ts b/modules/angular2/test/core/compiler/shadow_css_spec.ts
index 1e9c334fd2..6159b71206 100644
--- a/modules/angular2/test/core/compiler/shadow_css_spec.ts
+++ b/modules/angular2/test/core/compiler/shadow_css_spec.ts
@@ -155,10 +155,14 @@ export function main() {
       expect(css).toEqual('x[a] y[a] {}');
     });
 
-    it('should pass through @import directives', () => {
-      var styleStr = '@import url("https://fonts.googleapis.com/css?family=Roboto");';
-      var css = s(styleStr, 'a');
-      expect(css).toEqual(styleStr);
-    });
+    // TODO: can't work in Firefox, see https://bugzilla.mozilla.org/show_bug.cgi?id=625013
+    // Issue opened to track that: https://github.com/angular/angular/issues/4628
+    if (!browserDetection.isFirefox) {
+      it('should pass through @import directives', () => {
+        var styleStr = '@import url("https://fonts.googleapis.com/css?family=Roboto");';
+        var css = s(styleStr, 'a');
+        expect(css).toEqual(styleStr);
+      });
+    }
   });
 }