I don't have that many browser extensions installed, but the ones i have i use a lot:
ColorPick Eyedropper: for picking colors from websites.
WhatFont: just hover over any text on a page, and it will tell you what font is used.
Wappalyzer: find out what websites are built with.
Awesome Screenshot, Eye Dropper for professional purposes. Another really good one is Return Youtube Dislike, very useful when you're browsing YT for learning or tutorials - but turned off comments are usually a tell tale sign of a poor video. Toggl is a good one for productivity
And I second Honey!
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