Oh undo function, what would I do without you? 
Well, I would probably be forced to do it again – but that is beside the point.  I love being able to reopen a closed tab or window in Firefox.  It has saved my rear end many times.  This is just one of those Firefox tips you really should memorize.

Backing up your bookmarks is one of those chores you have on your to-do list but never get around to it.  Then when they are lost, you say – I wish I would have.  Here are a few Firefox bookmark backup techniques to help you out.
How to Backup Your Bookmarks Manually
From the Firefox menu bar go to Bookmarks >  Organize Bookmarks to bring up your bookmarks manager.  Now you want to click the top button that says Import and Backup.
[...]

Hey, here is a cool new tip I just found out about. Say you have two Firefox Windows open with both having multiple tabs. You can drag a tab from one Firefox browser window to the next. Here is a better description of the cool tab tip from the source:
Users who have tabs open in multiple Firefox windows can drag and drop tabs across separate browser windows. Using this technique you can consolidate all of your tabs [...]

Want to know how to turn off that annoying “session restore” window that you get when Firefox tries to start back up from a crash? Ok, maybe annoying is a little harsh. A lot of people like the window, and a lot of people don’t like it. Who am I to judge?
If you find yourself in the camp with the annoyed folks, this is what you do:
1. type about:config in your browser URL
2. go to the browser.sessionstore.enabled [...]

Since the release of Firefox 2, I have not used the session restore that is built into Firefox that much. In fact, I had nearly forgotten about it till I read this post over at Kyle’s Cove talking about how to get it setup.
There are some new features in Firefox 2.0 that haven’t received much mention yet. One of these is the new session restore feature. In the past, people have used Google Browser Sync [...]

One of the best tools I have found thus far for backing up your settings and profile in Firefox is MozBackup. I have tried them all, and this freeware program is the one I keep coming back to.
MozBackup is a simple utility for creating backups of Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, Mozilla Suite and Netscape profiles.
It seems like some other backup programs for Firefox miss something, or don’t restore just right. MozBackup does just about everything right, [...]

This weekend I made a big mistake, I accidently deleted one of my folders inside of my bookmarks. I looked around for help, but there was none to be found. How did I get this folder back?
Well, all you have to do is open the Bookmarks Manager (Click on Bookmarks > Manage Bookmarks). Once you are in there, hit the Ctrl key and Z key to undo your last action. You can also go up and [...]