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Firefox 123.0 changed DNS settings? (lemmy.ml)

submitted 9 months ago by [email protected] to c/[email protected]

5 comments fedilink hide all child comments

After installing Firefox 123.0 I ran a Mullvad Connection check https://mullvad.net/en/check and found I had a DNS leak. Turns out that Firefox had changed the settings under "DNS over HTTPS" so that my Mullvad DNS wasn't being used any more. After changing this setting to "off" in Firefox, the Mullvad check passed.

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[–] [email protected] 18 points 9 months ago

Note that this isn't really a DNS leak. DoH is also going through the VPN proxy, so no data is leaked anywhere here.

What the "DNS leak test" does is to check whether you're using Mullvad's DNS servers. That's it. It doesn't and cannot actually check whether or not your DNS requests happen through the proxy or not.

[–] [email protected] 6 points 9 months ago

In my case the setting stayed off after upgrade.

[–] eager_eagle 4 points 9 months ago

My Firefox DNS over HTTPS settings are as they were before the upgrade. Maybe this is Flatpak-specific?

[–] [email protected] 2 points 9 months ago

I should have mentioned, I am running the Flatpak version of Firefox on Kubuntu 23.10

[–] [email protected] -1 points 9 months ago

That should be more secure and private