nice work Rated 4 out of 5 stars

works fine for me in FF 20.0.x

the only flaw i observed is this:
* the icon left to the text with the current settings will dis-appear when choosen in options but the space it occupied is persistant - thus the utility takes up more space than needed in the toolbar.

my suggestion for improvement:
* allow the text to be a two-liner tosave further space

This review is for a previous version of the add-on ( 

It is a known Issue, as I wrote, in "version information", in standard CSS for mode= icons and iconsize=large when label is forced to show there are few problems.