Mozilla Firefox is a fast browser, but over time it slows down due to the fragmentation of the profile databases. A free tool called SpeedyFox is designed specially to resolve that problem. The method used in SpeedyFox is 100% safe for your profile (e.g., bookmarks, passwords, etc). Their website claims that, once optimized using SpeedyFox, Firefox can run up to three times faster than before optimization.
Download SpeedyFox from http://www.crystalidea.com/speedyfox.
Once you install SpeedyFox, it opens immediately to the window pictured below. If you have multiple profiles, they are listed in the Profile drop-down list and you can select one to optimize. To optimize the selected profile, click the Speed Up My Firefox button.
You can also speed up Firefox using the Optimize option under the File menu.
For those of you who like running programs from the command line, SpeedyFox provides some command line syntax. Select Command line syntax from the Help menu.
A dialog box displays the available command line switches and their functions.
If you are running a portable version of Firefox, the last command line switch is handy for telling SpeedyFox exactly where the profile to be optimized resides.
When we tested SpeedyFox in Windows XP, Firefox did speed up some, even with loading the 17 tabs we had saved at the time.
SpeedyFox works in Windows 2000, XP, Vista, and 7.
by Lori Kaufman