My personal list of addons that I use every day:
– [ScribeFire](http://scribefire.com/) addin for blogging.
– The [del.icio.us](http://del.icio.us/help/firefox/extension) addin for tagging web pages.
– The [del.icio.us Bookmarks](https://addons.mozilla.org/en-US/firefox/addon/3615) replaces Firefox bookmarks with del.icio.us bookmarks.
– [Google notebook](http://www.google.com/googlenotebook/faq.html) addin.
– [Delegate To Todoist](http://amix.dk/blog/viewEntry/19142) – moves tasks from gmail to on-line to-do list.
Web development tools:
– [FireBug](http://www.getfirebug.com/) XHTML/CSS/Javascript/HTTP browser debugger.
– The [WebDeveloper](http://chrispederick.com/work/web-developer/) addin.
– [IEView](http://ieview.mozdev.org/) “View this page in IE”
– [ColorZilla](http://www.iosart.com/firefox/colorzilla/) – eye-drop tool to measure colours (returns CSS colour values)
– [MeasureIt](http://www.kevinfreitas.net/extensions/measureit/) – on-screen pixel ruler for measuring element sizes.
– [Validaty](http://gemal.dk/mozilla/validaty.html) – validates current web page
– [View Source](https://addons.mozilla.org/en-US/firefox/addon/394) with external editor.
Addins that are installed but net yet used in anger:
– [Clipmarks](http://clipmarks.com/)
– [Zotero](http://www.zotero.org/) – bibliographic data manager
– [Greasemonkey](http://greasemonkey.mozdev.org/) JavaScript engine for controlling the browser.
Powered by [ScribeFire](http://scribefire.com/).