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" that don't look so suspicious. Imagine how many developers have accepted these offers. Then look at the number of extensions in your browser and think about how much risk there is that you have an extension with malware.
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.