Actually, some of these add-ons can also be installed on IE, so it's worth checking the URLs for more info even if you don't use Firefox.
1. Fluffbusting Purity for Facebook
This add-on wil get rid of various extraneous game and quiz messages sent to your Facebook page
go to
http://www.fbpurity.com/2. ePub reader
I've written about this great epub reader previously
http://kestrell.livejournal.com/585130.htmland the recently updated version is even more accessible than before as the tool bar buttons have been labeled in a way which shows up as real names in screen readers, as opposed to the previous garbled graphic labels, although I find the choice of the phrases "next chapter" and "previous chapter" kind of confusing, as at times the next/previous sections can be something like title or acknowledgement pages.
3. FlashMute,
Gets rid of flash audio which loads automatically.
http://www.indev.no/?p=projects#flashmuteNote on how to use from installation page:
When executed, FlashMute will put a new icon in your systray (which normally can be found at the lower right of your screen). When single-clicking this icon, it will alternate between its normal (unmuted) "F"-state, and the (muted) "F" with a red X across it. When in the normal state, Flash movies will be allowed to use sound output, but when the red X is displayed, Flash will be denied access to your audio hardware.
Pressing CTRL + ALT + M will switch between muted and unmuted mode. This is a hotkey alternative to single-clicking the icon. It also serves as a panic-button if a loud Flash movie jumps up on you.
4. Visum, which can help solve those inaccessible captchas.
http://www.webvisum.com/ download page at
http://www.webvisum.com/en/main/download Edited later: The site is now loading but you do have to go to register and request an invitation before you can download the add-on.
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