Taken from http://firefoxsuck.blogspot.com/

I have been having all types of problems with Firefox 3 lately.  When I go to shut it down, sometimes it takes more than a minute to completely close out the process, so it prevents me from re-opening the browser unless I open up the Task Manager and manually kill the process.  This is annoying enough, but recently, I have noticed something even worse:

Firefox has been eating up all of my memory!  I look at the sidebar widget on my desktop and notice that memory usage has been going all the way up to 99%, and this causes all my other applications to freeze up: Dreamweaver, Photoshop, Illustrator, Excel, Combat Arms, TweetDeck, you name it.

I found a couple of solutions that should come in handy, bearing in mind that the #30DC recommended browser this year is Firefox, not Flock.  This link describes how to minimize your memory usage, and set the disk cache size, as well as direct memory usage to be reduced upon minimizing your window. To do this you will open a new tab and type in “about:config” and follow the instructions at the above link to make your computer run better when using Firefox.

Another fix that I implemented today was getting rid of the Google Toolbar, which was only useful to me for the PageRank indicator (which is inaccurate, and redundant since my other SEO add-ons will already give me this information). To do this, you can’t just remove the Google toolbar by unselecting it under the View menu, but instead you must actually go into Tools -> Addons and disable it (then restart Firefox).

Finally, I noticed that I was no longer able to use CTRL+T to open a new tab, NEITHER was I able to open a new tab by selecting File -> New Tab.  This is extremely annoying, since I usually have between 10 and 20 tabs open at any given time.  The solution?  Disable the AVG Free toolbar (which is forced upon you each time you install/update AVG Free.  I love AVG, I have not ever had a problem with a virus since I started using it three years ago (NORTON SUCKS!) but the toolbar is unnecessary and annoying.