Remember that extensions installed in the browser have more permissions then they should and they can do a lot of harm in the hands of the wrong developers.
Its a know issue the some well intention-ed extensions get acquired and then start to spy on you or steal your data.
Do you use a popular browser extension? How confident are you that the creator wouldn’t accept a $10k offer to hand it over only to have it then go rogue on you? https://twitter.com/nikolaihampton/status/1037449795604905985