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Pop Block for Firefox is a handy and reliable browser extension designed to provide a simple way to control the visibility of the web content while browsing the Internet.
The addon is linked to a service that allows you to define a list of keywords you wish to block. These filters can be anything: celebrity names, text that describes adult content, etc.
Note: An account is required for the extension to work properly.
Requirements:
· Firefox 14.0 and later
What's New in This Release: [ read full changelog ]
· Added improvements for image matching. Keyword matching now running even faster.

Via: Pop Block for Firefox 1.0.0