I think there's a big difference between commercial web browser extensions that are basically turning into what toolbars used to be and (usually) open-source ex

I think there's a big difference between commercial web browser extensions that are basically turning into what toolbars used to be and (usually) open-source extensions that really are what they say - something that extends what your browser can do. A well-made extension these days with no ulterior motives will be scoped tightly to only the site it's designed for or not even that, if it only modifies the browser chrome. I have like 20-30 extensions currently installed on my workstation, but only three of them have global content access (uBlock, Bitwarden, Dark Reader - all FOSS). The rest are highly site-specific and don't even see any other sites, so I'm not too worried about them.