Advice Request What does this mean?

[ng4ever]

Should I leave enabled or disable ?

 

[Thales]

It means your browsing is gonna be safer!

 

[silversurfer]

Should I leave enabled or disable ?

Looks like related to DoH settings in Firefox, you have to enable if you want to use DoH while browsing with Firefox.

Opt-out​

If you’re an existing Firefox user in a locale where we’ve rolled out DoH by default, you’ll receive a notification in Firefox if and when DoH is first enabled, allowing you to choose not to use DoH and instead continue using your default OS DNS resolver.

In addition, Firefox will check for certain functions that might be affected if DoH is enabled, including:

• Are parental controls enabled?
• Is the default DNS server filtering potentially malicious content?
• Is the device managed by an organization that might have a special DNS configuration?

If any of these tests determine that DoH might interfere with the function, DoH will not be enabled. These tests will run every time the device connects to a different network.

Firefox DNS-over-HTTPS | Firefox Help

DoH improves privacy by hiding domain name lookups from anyone lurking on public Wi-Fi, your ISP or others on your local network. Learn more.

support.mozilla.org