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Evernote Web Clipper
Because I do so much research and writing, I like to keep clips of Web pages and articles I find. In the process of researching my most recent two books, I've clipped thousands of pages. I used to use a tool called Zotero, but found it cumbersome. When I moved to Chrome, I bought a premium license to Evernote and now I use the Evernote Web Clipper constantly.
How often used: Daily, during my morning reading, and then sporadically throughout my day.
Live without it factor: I rely heavily on searchable archives of Web pages, so for me, it's invaluable. I've had some problems with it (it likes to capture multiple copies of a page), and searching isn't as granular as Google, but even so, it's proven to be a must-have extension.