Browsers are for acquiring information.
Information should be relevant i.e. lead to decision.
....and cat videos and sexy ladies.
Cat videos and sexy ladies are getting AI generated anyway.
Information acquiring a naturel from webpages is very tiresome, especially when RSS is behind paywalls at best.
Makes sense for Ai agent to compile reports for you according to your preferences as to volume, level of detail and style.
Few extraordinary authors will have their blogs. The rest of web will be catered to machines scraping it.
Browser market/demand will thus be minimal, especially compared to it's dominance of desktop in recent decade.
Brave with it's default ad blocker (not dodgy plugins) has better chance of survival than preachy Fireflop SJW llc.
Fundamentals of Ai are contrary to the web Browser technology. Firefox is like Yellow pages trying to be relevant with Internet.