Good work on Version 1.0.4 Rated 4 out of 5 stars

Great work with the latest updated version, the only thing keeping me from using it my self is the fact that it overrides the colored toolbar button icons of L.A.R Grizzly toolbar button icons themes:
https://addons.mozilla.org/firefox/user/1828396

Maybe you could have the extension provide an Option for it not to change or effect the default toolbar buttons icons color?

This review is for a previous version of the add-on (1.0.2.1-signed). 

I'll add support for "L.A.R Grizzly toolbar-button-icons themes" on next release after 1.0.4 got reviewed. In fact its already working on my 1.0.5dev build by default without the need of a setable option.

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Just uploaded the current dev. version with support for "L.A.R Grizzly toolbar-button-icons themes".