try entering firefox safe mode and check disable addons
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Yes
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Dave Hyatt, Joe Hewitt, and Blake Ross, the people behind the Mozilla Project, began Firefox as an experimental branch.
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Try the add-on FoxyProxy, it replaces the default Firefox proxy
options and has more features. If that doesn't work, reinstall
FireFox, and make sure that you are running the latest version of
FireFox too!
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Firefox has a bug in version 3.6.11, 3.6.12, 3.6.13+ This bug is a problem in SQLite and causes bookmarks to become unbearably slow when searching on some systems. The estimated fix will be released with the public version of Firefox 4 however I urge you to politely ask them to create a hotfix update before it's release. at support.mozilla.com A link to the correct report is in the related links section below.