What Google Chrome extensions are you using?

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I just found out Google Chrome has come out with extensions too. I've been waiting for this feature since I started to use Chrome, as sometimes it's nice to have some additional tools installed in the web browser to help us out. I haven't really check out the available extensions yet. I've only installed the Google Dictionary Lookup, and hopefully it helps me to learn some English vocabulary online easier. There are so many extensions out there, and they all seem quite nice, so I'm just wondering what you guys are using and why do you like to use those extensions? You can download the extensions here: https://chrome.google.com/extensions/