I've developed a few browser extensions, and every week I receive numerous emails with "revenue offer". Some experienced developers know that offers like these will inject malware into the browsers of your users, but scammers who make these offers will not tell you about it. They offer "integrations...
I think the point is that even if an extension comes from a trusted source, the developer could fairly easily push out an update that turns the extension into malware. Check the GitHub link in another comment below where the developer posts the solicitation emails he gets on a regular basis offering to monetize his extension. He isn’t selling out, but maybe not every dev is as willing as he is to forgo a potentially lucrative offer.
To be specific: from trusted developers. Installing them only from the official repository (is it still possible to reasonably install them any other way?) won't help if a dev sells such an addon. On the other hand I cannot imagine someone like Raymond Hill (the uBlock Origin dev) doing it, considering his track record.
I think i remember a post not to far back with a similar topic. Not sure if it was from the developer of the hooverzoom extension itself, but it definitly referenced some offers they collected.
I love the offer of almost $15k to then say they can bargain if the users are active, like if it's worth that much without active users then that's definitely shady.
To add to the blog post, if you use user scripts, utilize your manager's blacklist and learn REGEX.
If needed, use Group Policy, Regedit or .plists on macOS to blacklist domains to prevent an extension from running on them. As an example, I use Shutup.css to block comments online, but on something like Lemmy, I want to see comments as that's primarily how content is created and adding it to my extension domain blacklist prevents the extension from running on the website or any lemmy domains.
That's why on my work PC I use a completely vanilla Firefox, gotta live with the ads. But I'm not risking giving full access to website content to any extension