Firefox’s add-ons are proving invaluable to me as a web tester but there are also some awesome tools for improving the efficiency of everyday tasks too. I’ve compiled my favourite Firefox Add-ons here (in no particular order).
Selenium IDE https://addons.mozilla.org/en-US/firefox/addon/2079
Web automation. Fast becoming an industry standard tool. This is the IDE version. Visit http://seleniumhq.org/ for more information on the RC version and grid.
Flips your Firefox tab in to Internet Explorer mode. Super useful.
Re-sizes your window to preconfigured sizes
Super little screen capture tool.
The best way of tracking and testing of cookies in your browser.
Social bookmarking. Never lose a site of interest again and share them with the community too. Perfect for bookmarking testing sites, information and snippets.
Super shortcut for clearing out the cache within the browser.
Copy Plain Text https://addons.mozilla.org/en-US/firefox/addon/134
Tool for copying text in plain text format only. Drops all of the text formatting giving you just the text.
Fiddler Hook http://www.fiddler2.com/fiddler2/addons/fiddlerhook/
Firefox addon for integrating with fiddler. How can you web test without some sort of HTTP debugging?
Download Status https://addons.mozilla.org/en-US/firefox/addon/26
Embeds your downloads in a toolbar at the bottom of the browser. Keeps it nice and tidy.
Superb tool that allows you to upload your Firefox bookmarks to a central server and then download them to any browser. Perfect for multiple computers; keeps it all in sync.
W3C Page Validator https://addons.mozilla.org/en-US/firefox/addon/2250
Check your page against W3C standards and compliance.
Brilliant for mocking up screens.
SQL Injection https://addons.mozilla.org/en-US/firefox/addon/6727
Does exactly as the name suggests
Quick Restart https://addons.mozilla.org/en-US/firefox/addon/3559
Restarts Firefox maintaining all tabs and open docs
How can you test websites without this one? Inspect your page elements.
Regular Expressions Tester https://addons.mozilla.org/en-US/firefox/addon/2077
Useful tool for testing Regular Expressions.
Quick Locale Switcher https://addons.mozilla.org/en-US/firefox/addon/1333
Genius tool for quickly switching your browser between locales. Really useful for multi locale sites.
Brilliant tool for tracking the http traffic in your browser.
Accessibility checking tool. Awesome.
Firefox Accessibility Tools https://addons.mozilla.org/en-US/firefox/addon/5809?src=api
Accessibility checking tool. Combined with TAW3 above you should have some indication of how accessible your sites are.
For more tools and testing hints and tips, check out the wiki at The Software Testing Club. http://wiki.softwaretestingclub.com/Software-Testing-Tools
Alan Richardson also sent me a link to a post he had done on browser add-ons over at Evil Tester. http://www.eviltester.com/index.php/2009/04/29/how-on-earth-did-we-test-the-web-without-these-tools/
Image from Flickr. http://www.flickr.com/photos/jakematesdesign/