What are the most useful chrome extensions?

AdBlock: https://chrome.google.com/webstore/detail/adblock/gighmmpiob...

Image Search: https://chrome.google.com/webstore/detail/search-by-image-by...

Hacker News Infinite Scroll: https://chrome.google.com/webstore/detail/hn-infinite-scroll...

Fireplug, useful to 'get credit' for what you read (think check-in via Foursquare. Track topics you've been reading, how you stack up against other readers, discover content recommended by other 'experts'..

<https://chrome.google.com/webstore/detail/fireplug/mcdpcejkg... >