Tools to test webpage accessibility so that your webpages are accessible to as many users as possible, to have your pages pass validation, and to meet web accessibility compliance laws and guidelines.
A listing of add-ons for me to find later when rebuilding profiles, for recommending add-ons to others, or for occasional usage. As of 3/15/2013, 83 installed, 60 enabled
Add-ons for Mozilla's mobile browser project Fennec. http://www.mozilla.com/en-US/mobile/
Thunderbird add-ons that I've either used for years, or tested and highly suggest.