Timezone: UTC

Change privacy.resistFingerprinting to false in about:config.

I already checked that while troubleshooting...It was "False" from the get go.

Also check that privacy.fingerprintingProtection.overrides is blank.

Does it still happen in Troubleshoot Mode?

Also check that privacy.fingerprintingProtection.overrides is blank. Does it still happen in Troubleshoot Mode?

Just tried Troubleshooting mode and it still produces the wrong time.

You can paste this JavaScript code in the Web Console or in the Browser Console to check the current local time in Firefox. You can possibly specify a different locale.

• https://firefox-source-docs.mozilla.org/devtools-user/web_console/

(new Date()).toLocaleString("en-US",{weekday:"long",day:"numeric",month:"long",year:"numeric",hour:"numeric",minute:"numeric",second:"numeric",hour12:false,timeZoneName:"short"});

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile. Make sure you stay signed out of your sync account when testing.

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required) where this happens?