Firefox plugins that block ads

Thanks to ScienceBlog's awful tornado ad (and the comments in PZ's post on the topic), I've just found three very nice Firefox plugins:

• Adblock - An extension that prevents most static ads from displaying on web pages (more information on their project page).
  
• Adblock Filterset.G Updater - A set of filters for Adblock that are automatically updated regularly.
  
• Flashblock - Replaces all flash objects with a static image that has a play button. If you want to see the animation, click play; if not, the flash animation stays static. This is great for eliminating animated ads from webpages.
  

[For more useful Firefox extensions, see these two posts.]

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• firefox
• online