Yes, it is incredibly hard to build an extension system.
Why does nobody build on top of Firefox and Chromium? Probably because tracking upstream changes will be incredibly difficult. I imagine as soon as FF releases a month worth of patches, trying to integrate them and sift through them would take thousands of hours.
Why does nobody build on top of Firefox and Chromium? Probably because tracking upstream changes will be incredibly difficult. I imagine as soon as FF releases a month worth of patches, trying to integrate them and sift through them would take thousands of hours.