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The other day I was telling you how to speed up Firefox 3.* by optimizing the .sqlite databases but it seems there is another thing that makes Firefox start up really slow - up to 1-2 minutes This only occurs on Windows and it happens because Firefox now shares it's temporarily internet files with Internet Explorer.

internet explorer options

To make Firefox start up faster, you must clean your temporarily internet files: in Internet Explorer > Tools > Internet Options, on the "General" tab there is a section called "Browsing history". Click the "Delete" button, under "Temporarily internet files" click "Delete files" and then start Firefox. It should now open up faster.

It is also advisable to delete your Windows temporarily files.

This appears to be a known bug and should be fixed in Firefox 3.5.1.

To delete all such temporarily files and other useless junk, you may want to use History Killer Pro for which I still have a few free license keys to give to whomever comments.