How to Set Up and Use a Firefox Proxy for Better Privacy? or Is a Firefox Proxy the Best Way to Brows

Ugh, Firefox proxy issues are the worst.

First, clear your cache and cookies—sometimes old data messes with connections.

Also, try flipping the "DNS over HTTPS" setting in Firefox (Options > General > Network Settings). Weirdly, that fixed it for me.

If your ISP is shady, maybe try a VPN instead? ProtonVPN has a free tier that’s decent for testing.