Qualys BrowserCheck
Start a browser check to identify any security issues in your browser.
https://browsercheck.qualys.com/Dummy Lipsum Firefox Add-on
Generate "Lorem Ipsum" dummy text (from http://www.lipsum.com).
https://addons.mozilla.org/en-US/firefox/addon/dummy-lipsum/RSS Icon :: Add-ons for Firefox
Adds the RSS Icon back into the Location Bar -- Bringing back the FF 3.X behavior
https://addons.mozilla.org/af/firefox/addon/241029/Nested Twitter Replies for Greasemonkey
Adds nested replies to every Twitter conversation thread.
http://userscripts.org/scripts/show/30598Twitter atSuggest (Greasemonkey) for Greasemonkey
Provides a box of suggested names from the list of users you follow when you begin typing @xx in the status input on Twitter.
http://userscripts.org/scripts/show/67537Omnibar :: Add-ons for Firefox
Integrates location bar and search bar into one. Shows search and url suggestions. Quickly switch search engine using search keywords or use advanced operator "@[engine] [search query]". Provides auto-complete popup styles for compact displays.
https://addons.mozilla.org/en-US/firefox/addon/8823Introducing Yip: A Unified Notification System for the Web « abi's blog
Introducing Yip: A Unified Notification System for the Web
http://abcdefu.wordpress.com/2009/06/09/introducing-yip-an-unified-notification-system-for-the-web/WebAIM: Blog - History of the browser user-agent string
History of the browser user-agent string
http://webaim.org/blog/user-agent-string-history/