Here's how:

1) Type about:preferences#privacy in the URL bar and press enter.

2) Scroll down until you see Firefox Data Collection & Use

3) Uncheck what you do not wish to share.

4) Restart Firefox.

If this solved your problem, please mark as solution.

This did not work. There are three boxes and none are checked, so I can't uncheck anything.

Go to Preferences/Privacy & Security.

Your options should look like the attached screenshot.

Went to Preferences/Privacy & Security This did not work. There are three boxes and none are checked, so I can't uncheck anything.

Would you please try this :

Type in the address bar about:config (press Enter) (promise to be careful, if asked)

Type in the search bar datareporting.healthreport

and look for the preferences :

datareporting.healthreport.uploadEnabled

datareporting.healthreport.service.enabled

datareporting.healthreport.service.firstRun

Set their values to false - then close and restart Firefox.

Does that do the trick  ?

You can also look at the telemetry prefs.

toolkit.telemetry.enabled = false
toolkit.telemetry.server = <blank>
toolkit.telemetry.unified = false
toolkit.telemetry.unifiedIsOptIn = false

u4ea said

I want to turn this off and I searched and found an older solution. It shows that I should put about:preferences#advanced in the address bar and select data choices. Data choices is not available to choose! This is very annoying to have popup every time. Thanks in advance. u4ea

I think this solved my problem! Thank you very much for the help!

I really do appreciate you taking the time to help me and others!

u4ea said

I think this solved my problem! Thank you very much for the help! I really do appreciate you taking the time to help me and others!

I'm sure that I speak for my fellow contributors as well, when I say :

My pleasure - glad you're problem is solved  !

If you want to hide the notification itself, like when creating blank profile for users and not wanting them being bothered by it:

user_pref("datareporting.policy.dataSubmissionPolicyAcceptedVersion", 2); user_pref("datareporting.policy.dataSubmissionPolicyNotifiedTime", "1533619817422");

The time is current, from around now when I was writing this. Maybe it would need to be changed.