WebAIM: Blog - History of the browser user-agent string
History of the browser user-agent string
http://webaim.org/blog/user-agent-string-history/SIMILE | Seek
“Seek” adds faceted browsing features to Mozilla Thunderbird and lets you search through your email more effectively.
http://simile.mit.edu/seek/MoreColsForAddressBook
Add a lot of features to the Thunderbird Addressbook
http://nic-nac-project.de/~kaosmos/morecols-en.htmlAutocomplete Manager - official page
The extension provides advanced features for the address Autocomplete component and includes fixes for location bar bugs, as well as a rudimentary history manager.
http://www.cs.ucla.edu/~nikitas/acmanager/It's All Text! :: Firefox Add-ons
Edit textareas using an external editor, because it's all text!
https://addons.mozilla.org/en-US/firefox/addon/4125Thunderbird Mail DE - Allow HTML temporary
This extension allows to have HTML temporary enabled/allowed in the selected message by only one click. This makes life easier for all people using plain text mode as default.
http://allowhtmltemp.thunderbird-mail.de/index-en.phpFaviconizeTab | Firefox Add-ons | Mozilla Corporation
This extension adds a new "FaviconizeTab" option to the context menu of the tab. When it is clicked, The width of the tab becomes small up to the size of favicon. It returns to the former size when "FaviconizeTab" is clicked again.
https://addons.mozilla.org/firefox/3780/FAYT | Firefox Add-ons | Mozilla Corporation
In Firefox 2 the useful "Find As You Type" bar has ben being replaced by a poor search box with no buttons. To get your loved "Find As You Type" bar back in Firefox 2, it's enough to install FAYT extension.
https://addons.mozilla.org/firefox/3650/OpenSearchFox | Firefox Add-ons | Mozilla Corporation
This is an extension to automagically add search engines to Firefox by right clicking in the input field.
https://addons.mozilla.org/firefox/3698/