You may be experimenting a ‘bug’ when you find yourself with very long start up times after upgrading to Firefox 3.5. This may be due to a change in how Firefox 3.5 gets the randomness it needs for security purposes on Windows. It is also because of too many temporary, history or recent document files sitting in your Windows locations that slows down the data generation processes in Firefox 3.5. 
Firefox 3.5 looks for more files and sub-folders for increased randomness, but it has led to unexpected results for several users with too many temporary folders or files resulting in slow start ups. The procedure involves scanning some temporary folders where looking for bits normally added by OS and other applications operations are present.
Firefox 3.5 users have reported a noticeable improvement after deleting their temporary folders and Internet Temporary Files that are generated by Internet Explorer. Actually, Firefox 3.5 pulls data from certain file locations for randomized security purposes which sometimes can lead to annoying slow start-ups in Windows. You can speed things up by cleaning out certain folder locations in Windows.
The Mozilla Links given below recommends cleaning out these folders to keep the browser working:
C:Documents and Settings*user*Local SettingsHistory
C:Documents and Settings*user*Local SettingsTemporary Internet Files
C:Documents and Settings*user*My Recent Documents
C:Documents and Settings*user*Temp
On Vista or Windows 7 systems setting up Firefox 3.5 to automatically clean out your temporary files after browsing, as explained at the link above, helps prevent the accumulation from building again. However, the users who trade browsing time with Internet Explorer may have to occasionally work this manual method to wipe out those files where they need to replace “Documents and Settings” simply.
Windows only app
The Firefox lovers have no doubt already updated to the recently released Firefox 3.5 for its amazing new features, but if you are more the portable type, Firefox 3.5 Portable Edition is officially available for download.
Firefox 3.5 Portable
The Firefox 3.5 portable version can be downloaded from the web site at PortableApps.com. They are the makers of the popular Portable Apps Suite and brings all the bets features that come with Firefox 3.5 to your pen drive. It is mandatory for a little bit of config tweaking to get your extensions working with Firefox 3.5, but besides that the portable version looks like it’s ready to go along way in adding value to Firedox 3.5.









