you might find this useful: https://github.com/classvsoftware/under-new-management
my port (and now fork): https://github.com/maxtheaxe/under-new-management-firefox
they currently (PRs are welcome!) only check listing info. mine doesn't route requests through an external (non addon store) server.
a couple PRs are overdue on mine due to linting making the diffs impossible. I'll get to it. (see the wxt-migration branch)
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).