Firefox is a great browesr, the extensions available make life on the internet so much more convenient and productive. I have *never* used Internet Explorer as my primary browser, prior to Firefox I used Netscape and SeaMonkey. When I see others using IE or Firefox without extensions I cringe. All those ads (Yuk!), no easy way to navigate through page history without moving the mouse plus a click or three. Consider having bookmark syncing across browser types /operating systems. Auto tab opening. We get so spoiled so easily.
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Click on image for larger view.
As great as it is, Firefox is no longer the fastest browser available, it is almost as slow as Internet Explorer IMHO. Google Chrome browser is so much faster, but extensions are not available with Chrome 3 or earlier. Despite the raw speed, the lack of the extra functions I’ve grown accustomed to were missing.Enter Chrome 4.0 Beta with extensions. I checked out the extension capability and lo and behold there are a ton available!! In fact I have found equivalent extensions to my Firefox extensions, minus one I like a lot (Tab Mix Plus). Chrome has some great extensions that are NOT available for Firefox, all the latest extension writing talent appears to have migrated to Chrome. I found a great Twitter client called Metrist, clean easy interface with a count for unread tweets, re-tweet ad replies all in a small package. I also found a Facebook extension called Facebook Cleanup, which allows one to get more space for posts, it changes the page from the default 3 column layout to two column, much neater and more readable!! Oh and Facebook ads are history. I haven’t found a similar cleanup add-on for Firefox.
Chrome is so much faster, both to load initially and render web pages. I can’t find an extension in Chrome that replaces Tab Mix Plus. The feature I love is the automatic opening of tabs when clicking on favorites or URL’s entered into the address bar (once you get used to it, you can’t go back).
Above and to the left are the extensions I use in Firefox 3.5.5, and below to the right those I have installed in Chrome 4 Beta. Once I can find an extension that will open tabs automatically by clicking on favorites or when I manually enter a URL, I’m sold and will most likely switch. The extension ‘action’ appears to be with Google right now.
JPWhite's Tech Blog 
I have exactly the same problem. Firefox is getting too slow, but I need a browser with tab mix.
It’s beena while since I wrote this article. As of now I hardly ever use Firefox. I use Chrome as a primary browser and use IE once in a while if need be.