No big deal, just some add-ons I like. I hear about them from places--Leo LaPorte, Steve Gibson, Lifehacker. They make me happy.
Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
Collector's Note I learned a lot about HTML and CSS using Firebug to view source code. It interacts with the page being viewed, so you can make changes and see what they would look like, etc.
The first and only download manager/accelerator built inside Firefox!
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
Collector's Note I love Evernote. This is one of many ways to have Firefox interface with EN.
Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!
Adds ClickOnce support and the ability to report installed .NET versions to the web server.
Collector's Note Some program or other needed this; I don't remember which now.
AiOS lets you open various windows as sidebar panels, and quickly switch between them. So it put an end to the window chaos! In addition to bookmarks and history it opens dialogues such as downloads, add-ons and more in the sidebar.
Collector's Note Convenient
Add useful extra features to Gmail, like hierarchical labels, an unread message icon on your browser tab, file attachment icons, and more.
This extension adds a new "FaviconizeTab" option to the context menu of the tab...
Replace the standard menu bar with a tiny menu popup.
Collector's Note To increase browser screen real estate by removing an entire menu bar.
An extension that allows for the use of dynamic commands in Firefox.
Tabs Open Relative makes all new tabs open to the right of the current tab, rather than at the far right of the tab bar (optionally this only applies to links).