Correct changelog for #152: Firefox 34 still have that changes
Correctly remove -moz-resolution from tab icon
See view-source:chrome://browser/content/tabbrowser.xml
<method name="setIcon">
            if (sizedIconUrl) {
              let size = Math.round(16 * window.devicePixelRatio);
              sizedIconUrl += (sizedIconUrl.contains("#") ? "&" : "#") +
                              "-moz-resolution=" + size + "," + size;
            }
(#147)
Use .image getter instead of .getAttribute()
(#147)