Turn tabs of your choice into permanent tabs. PermaTabs can't be closed accidentally no matter what you click (even actions like "Close other tabs" will not affect them) and will stick around between sessions.
Ideal for keeping URLs you use often, always one tab away. Also, ideal for picking up specific articles where you left off during a previous session.
*** IMPORTANT ***
This version of PermaTabs has not been updated to work with Firefox 3. A newer version by a different author is available at https://addons.mozilla.org/en-US/firefox/addon/7816.
From first installation PermaTabs includes three random sample tabs (from a built in list) to get you started. Maybe you'll discover a useful site you never knew about?
Adding or removing a permatab is simple - right click a site's tab, and check/uncheck "Permanent Tab".
Must read: one of the default permatabs installed on first installation is an affiliate URL to eBay.com. You can of course remove this and the other sample permatabs, and create your own (which is the whole idea).