Rated 3 out of 5 stars
"Status Buttons 3.0" seems to work well. However, if "Organize Status Bar 0.6.2" (https://addons.mozilla.org/en-US/firefox/addon/1759) is also installed I cannot open the "Customize Toolbar" dialog at all. There is no mention of this extension at the indicated homepage. The author of "Organize Status Bar" has created an unofficial patched version of this extension to fix the problem.