Thank you! (And how to customize) Rated 4 out of 5 stars

Does what it says; thank you!

For those who want to customize the color, etc., it takes a little skill but it's not hard. (Follow this procedure at your own risk! If you're not sure of what you're doing, I'd backup your profile first!)
1) In your profile folder, in the extensions subfolder, find the the file
2) Backup the original, and then make another copy to work on.
3) On the working copy, rename the file extension to .zip and extract the files (this works for all XPI files, afaik)
4) \chrome\chromeFiles\content\ has most of the potential customizations. Make changes (see below for ideas)
5) In the zip file (step 3) replace the original files with your updated ones from step 4. Save a copy and remove the .zip extension. The extension should now be .xpi
6) Exit Firefox. Replace the original XPI (step 1) with the new one. You did backup the original, right?
7) Start Firefox and you should see the results of your changes.

Some possible changes:
- in tabcount.css you can change the color of the font by editing the following line. The 6 character string is the hex number for the 'web color'; change it to the color you want. Here's a guide:
#tabcount { color:#CC3300; }
- you can eliminate the icon by opening browser_overlay.xul and removing or commenting out this line:
<image src="chrome://tabcount/content/folder_navy.png" />