Firefox add-ons

[spudtater]

Firefox is great. I'm sure everybody knows that by now. But some of its best features are in the optional add-ons contributed by various developers. Here are some of my favourites:

For everybody:

• Adblock Plus: Does what it says on the tin. That said, I don't really use it for ad blocking much. I originally installed it for downloading pictures from Flickr.
• CustomizeGoogle: Twiddles with the output from Google in a variety of ways. Can remove Google ads. I like the fact that it adds direct links from Google image search.
• Duplicate Tab: Finally! Firefox really needs this one. Click on a tab, then click "duplicate tab", and the current page will be loaded again in another tab, with page history preserved and everything. Highly configurable; play around with the options until you get what you want.
• IE Tab: My mind boggled when I first saw this one. Addicted to tabs? Don't want to open a separate window when you just have to use IE for some site? Now you don't have to. Yup. IE inside Firefox.

For the seriously geeky:

• Firebug: The development tool. Displays the current page source in a separate frame, which you can then edit, with all changes displaying in real time on the page. All neatly formatted and collapsible. Right-click on any page item and click "inspect element" to find its source. Useful for developing your own pages, and for dicking about with form parameters and suchlike on other people's. Shows Javascript errors, too.
• Launchy: Slightly rough-around-the-edges, but handy. Open pages in a variety of different browsers, or in a media player, or text editors, or... Useful for development work, especially when combined with Multiple IEs.
• /Find Bar/: Regular expressions. Find bar. Need I say more?
• Source Viewer Tab: Open source code in a tab instead of a new window.
• View Cookies: Adds a 'cookies' tab to the page info window. Simple, yet indispensable.

What about you? Any gems to share?