A trick to view contents of zip/jar files in firefox 3. For viewing contents of filename.zip type following at location bar:

jar:file://< full path to filename.zip >!/

Algorithm used by firefox to assign password strength when setting master password. Smallest password that would get 100 on password meter can be : AAA@@@ or something similar. 

You may have read about firefox’s special about: pages like about:config, about:cache etc. There is one similar functionality in firefox which allows you to view page source of a page. You can type

view-source:http://www.google.com/

Provide functionality of del.icio.us website qith quick access right into your toolbar.  These features include: posting, searching, export/import  and quick links for blogging related tools. Some other features:

• Explore button which provide similar functionality as StumbleUpon.
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