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 Don't look at any more ads than you have to! Adblock Plus has filter subscriptions built in! In the past, I used another addon to update the ad filters, but this is no longer necessary. You do need to configure a filter subscription, which is fairly painless. Now you can start visiting that handful of ad-infested but useful sites again!
The first and only download manager/accelerator built inside Firefox!
Collector's Note DownThemAll! is much faster than the default download and gives you a lot of options for downloading multiple files.
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.
Collector's Note Tab Mix Plus is the most configurable tab add-on I know and keeps you from geeking around in about:config. My favorite setting is Single Window Mode, which turns new Firefox windows into new tabs in the existing window. Without it, to find an open tab, you have to go to every tab of every window, which is too time consuming. Without this feature, tabs are kind of a waste of time and I am better off navigating using the OS taskbar, which is what I ended up doing on Internet Explorer on another computer. It is very configurable, and you can tweak the context menus and click actions of the tabs to match how you work.Too many settings to list.
Integrates location bar and search bar into one. Shows search and url suggestions. Quickly switch search engine using search keywords. Provides different auto-complete popup styles for compact displays.
Collector's Note Choose one of the "slim" options and turn off search engine suggestions if, like me, you just want to condense the Awesomebar suggestions to one line. I used to use oldbar for this.
Bypass compulsory web registration with the context menu via www.bugmenot.com.
Collector's Note The BugMeNot add-on convinced at least one person to switch to Firefox. For many of those sites that require you to register before you can view free content, this logs in for you using a user-created database found on bugmenot.com. Now you can return to those sites you avoided previously.
NoRedirect lets the user take control of HTTP redirects. It can be used to interdict an ISP's DNS search redirection hijacks, preview/screen "shortened" URLs (e.g., TinyURL), stop the annoying redirection of "smart" error pages, etc.
Collector's Note If you have some ISP that hijacks DNS (and who doesn't these days), this extension will restore address bar search. Another one of those extensions that has the potential to convince people to switch to Firefox.
This extension adds a small box to web pages when it determines you are viewing a book. Clicking the box gives you a list of prices at other sites, as well as checking if your library carries the book.
Collector's Note With this Book Burro, you can go to a page for any book on certain websites such as Amazon.com, and see what other online stores are selling it for. You can even see if it is available at your local library! I always comparison shop with this as well as GetTextbooks.com before I buy a book.