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I like Firefox but it’s not as fast as it used to be.
This is a comprehensive, safe guide to optimizing Firefox 3.5 for speedy browsing.
For each suggestion, your mileage may vary.Before you proceed, create a new profile.
Quit Firefox, run “firefox.exe “profilemanager”, and create a new profile to experiment on.
Use the new profile as your default only if your performance improves.
Only those changes needed from a default installation are mentioned in this guide.
Use Blank Homepage, Default Theme, Minimal Extensions
Set your homepagetoabout:blank.
Use only must-have extensions with the default theme.
UseAdblock Plusand Flashblock toblock unwantedads and Flash.
exit the download window automatically when all downloads are finished.
Turn off download history inOptions->Privacy,Custom prefs for history.
InOptions->Privacy, useCustom options for history, and reduce length of remembered history to 15 days.
Customize General Advanced Options
InOptions->Advanced->General->Accessibility:
7.
Clean them up using theCheckPlacesFirefox extension, and uninstall after you’re done.
Firefox checksLive Bookmarksevery hour for updates.
Use a dedicated RSS Reader likeGoogle Readerinstead.
Delete the presetLatest HeadlinesLive Bookmark.
Enterabout:configin the Firefox address bar in an empty tab.
Click " I’ll be careful, I promise!'.
Also, entries you change are displayed in bold, and can be reset using the right-click context-menu.
(Some of these tips are via TweakguidesFirefox Tweak Guide)