"AI overview" (which I happen to find really useful) was only available on Chrome and Safari for at least a few months.

Sure, it's a lab experiment or whatever, but these are just words, and the effect is that I have to use a different browser to be able to use them, for absolutely no technical reason. (The LLM is running on Google's servers and provides plaintext. I think Firefox could handle that.)

Just visit this on Firefox if you want to see for yourself, including a big "install Chrome" call to action: https://labs.google.com/search/install