Multiple things: 1) extensions are overly permissive, 2) so many of them are sold to shady entities without peep from the developer, and 3) it's never been easier to generate my own tooling.
I just download the extension file, check it out, and install it locally. No worries about future updates until something breaks (doesn't tend to happen).
fair enough. I'll add that one fantastic use I've found for LLMs is quickly checking the source of a given addon (though obviously this is no replacement for a real audit or finely-grained permissions).
I'd be doing this type of thing a lot more if browsers didn't make it difficult to load unpacked addons (in which case I could be modifying things I didn't like on the fly).