Extensions aren't a reliable solution to privacy and security. Why would you give access to all websites you visit to a 3rd party? I barely trust browser developers these days, let alone some 3rd party developer.

And, no, I can't be bothered to review their source code if it's available, or to trust that I'm actually running said code, that it won't become malicious eventually or bother with building it myself. Unless it's run on demand and for a single purpose, I suggest avoiding extensions altogether.