Copyurl+ which is a Firefox that enables you to easily select text from a webpage together with the URL.
Hmmm... won't install on Firefox 2, says it's only for 1.5...
You need to apply the Nightly Tester Compatibility fix.
Nightly Tester Tools :: Firefox Add-ons
This extension adds a few extras useful to those that regularly test nightly builds of Firefox, Thunderbird, Sunbird and Toolkit Seamonkey (Suiterunner).
The following is a brief list of the extension's features, for the full set of features please visit the extension home page.
* Extension compatibility fixing
* Titlebar customisation
* Build ID retrieval
* Breakpad information
* Restoring tabs from previous session
* Leak log analysis"https://addons.mozil...S/firefox/addon/6543
Once you install this Add-on Nightly Tester I mean, you will find that when you check on the "incompatible Add-Ons, there will be an "option" somewhere. I think if I remember correctly, when you go to your listing of Add-Ons, right click on the "offending Add-on" and you should see an option to "Fix" it.
By the way, I'm using Firefox 3.03