Just a quick PSA, if anyone noticed massive amounts of shows disappeared from Netflix the past week or two. Apparently they're getting stricter with VPN detection, and blocking per region licensed shows if we're on VPN.
I don't have a solution, but chiming in to say I had the same issue with Mullvad and Firefox, except without DNS over HTTPS. It was sometime in the past week while I was away from home, on a different ISP. I rebooted my machine and kept the client running so that it wouldn't happen again. As you pointed out, other browsers worked fine during this time.
Would you consider Hulu detecting my VPN as Mozilla being buggy?
No that would more likely be Hulu possessing a list of IP addresses known to belong to VPNs. Mozilla/Mullvad would both have the same problem there.
Honestly if Mozilla is working fine for you (Hulu aside) then stick with it, but if you do notice bugs then know that you're not alone
I don't know which OS you're on, but in case it's Linux, I suggest reading my comment above about Mozilla VPN bugs on Linux, and consider if you want to switch to Mullvad instead (it's the same servers as Mozilla, Mozilla just resells Mullvad service as a middleman). Except the Mullvad client software is different, and in my experience much less buggy.
Mullvad works much better than Mozilla VPN on Linux, despite the servers being the exact same servers.
Mozilla had some critical bugs that I reported but their support team kept repeatedly saying to please logout to clear the cache, and that they wouldn't forward my bug report to the dev team.
Mozilla VPN kill-switch doesn't always work on Linux. Sometimes network dropped and then I come back and see the Internet still works, except, it's not flowing through the VPN(!!!). the VPN app says something about an error connecting to the VPN.
Also a glitch where as soon as I bring up the logout/restart/shutdown menu on Ubuntu/Gnome, Mozilla VPN disconnects. I didn't logout, just bring up the menu to logout.
It's sad because I wanted to support Mozilla (and still do but not through their VPN product)
No issues whatsoever using Mullvad VPN directly. I'm a happy Mullvad user now.
Firefox 128.0.3 was released with a possibly related fix:
The timeline matches up with the problem we were seeing, it might have been a bug in Firefox version 128.
You might want to turn IPv6 back off and try the new Firefox update.