Rated 5 out of 5 stars

Awesome addon.
Works flawlessly with almost any other addon or interface modification.

Only aroblem: The text in sidebars like bookmarks is a little hard to read due to the transparent background.
It would be nice if it was possible to give the text a white shadow or change the transparency settings for the sidebar, like with every other part of the window.

This review is for a previous version of the add-on (1.0.9). 

Thanks.

The bookmarks and history sidebar content doesn't allow much customization. Some changes (background color/transparency) would have a negative effect on some other Firefox settings and windows. It is also not possible for bookmark/history content to have text shadows. The only feature I can provide atm, is a font color selector for those text areas. Check the latest devbuild (Version 1.1pre4): https://addons.mozilla.org/addon/glassmyfox/versions/