Bra tillägg till webbläsare

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Är det någon som har tips på bra tillägg till våra webbläsare?

Mina tips:

Xmarks
http://www.xmarks.com/
Install Xmarks on each computer you use, and it seamlessly integrates with your web browser and keeps your bookmarks safely backed up and in sync.
Xmarks will sync across browsers too. Today we support Firefox, Internet Explorer, and Safari (Mac OS).  + mer features.
Funkar till: Internet Explorer, Mozilla Firefox, Safari, Google Chrome

Adblock
Firefox: http://adblockplus.org/en/ eller Chrome: https://chrome.google.com/extensions/detail/gighmmpiobklfepjocnamgkkbiglidom
Ever been annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page? Install Adblock Plus now and get rid of them.
Funkar till: Mozilla Firefox, Google Chrome