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Hiding the Closing Button (X) on the Firefox Add-on Bar

Hey!

Since the introduction of Firefox 3 or 4 (I don't quite remember) and the removal of the status bar I have liked to use the Add-on bar instead. In the newer versions of Firefox, however, that Add-on bar comes with a closing button, an X on the very left.

Unfortunately, there is no built-in option to disable that particular button. Right-clicking and "Customize ..." doesn't allow moving or removing that button either.

After searching the web for a while, I stumbled upon a Google Groups thread: https://groups.google.com/group/mozilla.support.firefox/browse_thread/thread/d4a77426b84fe2b0

In that thread, Chris Ilias gave a simple solution (thank you!):

1. Go to your Firefox profile directory. For that, just enter about:support in your URL bar (or click on Firefox => Help => Troubleshooting) and click on the "Open Containing Folder" button next to "Profile Directory".
2. Close Firefox. (So maybe it would be better to continue reading these instructions beforehand and/or copy them into a text editor. 🙂 )
3. Enter the subfolder "chrome" in the profile directory.
4. Open the file "userChrome.css". If it does not exist, copy "userChrome-example.css" and rename the copy to "userChrome.css".
   If you are using Notepad, you won't be able to see line breaks / new lines. Therefore I recommend using a program that can interpret these kinds of line breaks, for example TextPad, Notepad++ or even WordPad, which comes with Windows itself.
5. Add the following line to the file:
   #addonbar-closebutton { display: none }
6. That's it! Save the file, start up Firefox again and enjoy the Add-on bar without a closing button!

These instructions were written for Firefox 11, but they should stay viable for the next couple of versions as well.

I hope this was of any help to you.

Thanks for reading!