Rated 4 out of 5 stars
I like the idea of this extension. On Linux some buttons already have icons - so for consistency I though this looked like a cute idea.
Unfortunately it seams to conflict with any button that had a icon already - nothing gets shown. Which destroys the effect.
Otherwise well done :)
i added some of the missing ones, but it might be awhile before i do the rest as i have to go through and check each button