Version 0.4.1

[1] https://addons.mozilla.org/en-US/firefox/addon/122/

For designing the new about:addons page, I used extensions.css 
from [1] as it was one of the first themes updated for Firefox 4.0

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Version 0.3.1:

[1] http://forums.mozillazine.org/viewtopic.php?p=5602915#p5602915

In [1] the user Philip Chee posted the fix to the Firefox 3.0 
"bookmarks toolbar items" bug.

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Version 0.3:

[1] http://forums.mozillazine.org/viewtopic.php?p=3273342#p3273342
[2] http://forums.mozillazine.org/viewtopic.php?p=3300292#p3300292
[3] https://addons.mozilla.org/en-US/firefox/addon/3471

In [1] and [2] I used the code to fix one of the problems of 
compatibility between Linux and Windows versions to finally make
it into one file. In [3] I used the theme to get the idea of the 
classic tabs in the Addons window.