In terms of a browser agent I built a chrome extension that essentially does everything i do in a browser using locally hosted models and/or APIs. It's called Marley. I can tell Marley to read or summarize the current page and read it aloud (Chatterbox TTS), edit the page, create domain-based site rules for css and js (DOM editing and injection), it has vision (can take screenshots) and action (can click on things and navigate, fill out forms, long horizon tasks, etc). It also can connect to an active CLI session that I might be running in a separate terminal for remote-control. So many things. It manages my passwords in an encrypted vault, it has a media player. LOL This is my 'One extension to rule them all'.