This is a great extensions that does what it says and saves a lot of time for me.

Installation is not easy, but if you follow the instructions on github it should work.

Since I had some problems with installations I got to look at most of the code and noticed nothing malicious-looking.

I'm giving only 4 stars because the are still many rough edges to be ironed out. The settings look like cr.p, for example, yubikey pw protection not supported, entry of otp codes on at least some pages is flaky.

But again: absolutely great extension that saves a lot of hassle locating and fiddling with the yubikey app (that eats CPU to make things worse) to copy codes.