Firefox has over a trillion nice Addons, just some useful ones I use:
You need both:
YouTube Auto Buffer & Auto HD & Remove Ads (this saved 9999999 mins of my life, it bypasses the 15-30 second long spots before a youtube clip)http://userscripts.org/scripts/show/49366
US: https://addons.mozilla.org/en-US/firefo ... asemonkey/
Ger: https://addons.mozilla.org/de/firefox/a ... asemonkey/
Adblocker plus (blocks porn/youtube flash advertising)
Ger: http://www.chip.de/downloads/Adblock-Pl ... 37623.html
Eng: https://addons.mozilla.org/en-US/firefo ... lock-plus/
Annoyed by adverts? Troubled by tracking? Bothered by banners? Install Adblock Plus now to regain control of the internet and change the way that you view the web.
Eng: https://addons.mozilla.org/en-US/firefo ... /noscript/
The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
(I can even surf on virus sites with this)
Gema Youtube ******. Germans unblocked:http://www.chip.de/downloads/ProxTube-f ... 95105.html
Das kostenlose Firefox Add-on ProxTube hilft Ihnen dabei, Videosperren auf YouTube zu umgehen.
Blank Your Monitor + Easy Reading (all time favourite too, I hate it at nights when the bright white colors kills my eyes)
Ger: https://addons.mozilla.org/de/firefox/a ... sy-readin/
US: https://addons.mozilla.org/en-US/firefo ... sy-readin/
BYM provide a simple mechanism to change Firefox color combination in order to invert any website to white and black colors.
post more, if u know some cool ones