I've just installed Firefox 3.1 Beta 1. I am glad that it loads and ends the process when I close it much faster than the current version. So far no crashes. If you're interested in trying it out, get it here.
http://www.mozilla.com/en-US/firefox/all-beta.html
One annoying feature that I didn't really like in Firefox 3.1 is the tab preview like what you see in Vista. It goes back and forth but I'd prefer to jump to the next tab instead.
Here is how to disable Firefox 3.1 tab preview when Ctrl+Tab is pressed.
1. Type
about:config at the URL bar.
2. Click I'll be careful, I promise! button
3. Type
browser.ctrlTab.mostRecentlyUsed at the filter.
4. Change the browser.ctrlTab.mostRecentlyUsed value to
false. You can either right click, select Toggle or simple double click on the value to change it.