Why does Firefox keep losing internet connection on my Mac when the Chrome browser is working fine?

If you change the "DNS over HTTPS" settings to anything else (off, on, different provider) or connect using the built–in VPN if you have the feature available, is there any change?

Is this on macOS 27 Golden Gate?

It is on DNS over HTTPS, I just updated to Golden Gate version 27. I have tried deleting the browser and reinstalling it, emptying my cache, and changing the proxy settings based on Firefox recommendations. None of those changes have done anything to help.

And disabling DNS over HTTPS or setting the provider to someone else? Or using the built–in VPN?

I tried disabling DNS over HTTPS, but when that didn't help, I turned it back on. I'm not using the Firefox VPN. I have it set to the default setting which is "DNS over HTTPS is using the provider Cloudflare" Thank you for the responses!

This is weird:( If this were only after Golden Gate update, and disabling DNS–over–HTTPS made a difference, it would be related to some new woes in Apple networking optimization — and remote changes have been shipped for that (do you have "remote improvements" enabled?).

But this sounds more like the connection "usually works"(?), but then at some point, like after a sleep, or changing system focus, screen time or something alike makes Firefox unable to connect out. How does that "dropped connectivity" look like? Blank tabs, stuck loading, or colorful error pages with network/connection errors or claiming servers unreachable etc.?