I want to use Webpage Screenshot, but no way am I going to allow an extension access to all my data on my computer (!). I realize a screenshot could access whatever's on my screen when I use it, but why on Earth would it need ALL THE DATA on my computer!?
As for sticking with extensions I trust, I could research till I'm blue in the face and feel 100% confident today, and tomorrow the company hires some high school kid who realizes she can access some crazy info on our computers.
As for least privilege, why is "all the data on my computer" the least that a screenshot extension could come up with?! Same goes for my other extensions.