Downloaded from your site.
Did a deep clean/fresh install. No good.
Another deep clean then grabbed from the MacAppStore. No good.
URLs? As I said, others have the same issue so there are myriad URLs. I suppose they're happy with clicking the extension icon. Or they use another browser. I will be coming from 1Password so expect it to just work.
Nevertheless, I've tried to paste several URLs to this reply. The site gives a blank response, as if I typed nothing. I omitted the URLs and was able to reply.