Fit Bookmark Icon

Resizes and slims a bookmark icon when it is registered. This extension works around Bug 175787 (https://Bugzilla.mozilla.org/show_bug.cgi?id=175787). NOTE:- This works only on ICON format icons, does not work on GIF or other icons.- This does not affect already existing icons. If you prefer to change them, please bookmark the same PaGE again and then reload that page for each bookmark.