Is "Disable Firefox Telemetry" safe to switch on?

A safe privacy setting. The main cost: Firefox shows that your browser is managed by policy.

Switch the tweak off in Frozen Tweaks. Switching it off puts back exactly what was there before, value for value.

Is "Disable Firefox Telemetry" free in Frozen Tweaks?

It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

DisableTelemetry: turning off Firefox telemetry by policy

Frost LIVESecurityProUndo: YesUpdated Oct 8, 2026View as Markdown

Short answer

Updated Oct 8, 2026

Firefox sends technical and interaction data to Mozilla by default. The DisableTelemetry policy set to 1 turns it off for the whole PC. In the registry it sets DisableTelemetry to 1 under HKLM\SOFTWARE\Policies\Mozilla\Firefox.

In the app

Disable Firefox TelemetryPRO

Registry

HKLMSOFTWARE\Policies\Mozilla\Firefox

DisableTelemetryYour previous value1

What the switch writes. Your current value may differ.

What it does

Firefox sends technical and interaction data to Mozilla by default. The DisableTelemetry policy set to 1 turns it off for the whole PC.

In the app the switch is called "Disable Firefox Telemetry", described there as: Sets the Firefox policy that turns telemetry off.

When it helps, and when it hurts

When it helps

Privacy for Firefox users.

When it hurts

Firefox shows that your browser is managed by policy.

What it writes

Exactly what the switch changes, read from the app's source. Switching it off is what the app writes when you turn the tweak off again.

Registry values the switch writes.
Key and value	With the tweak	Switching it off
HKLMSOFTWARE\Policies\Mozilla\FirefoxDisableTelemetry	1	Your previous valueSaved before the change, or deleted if there was none.

From the app's source (pack_extra.hpp), app 2.0.0, checked Oct 8, 2026.

The same change by hand

You do not need the app for this one. These commands make the changes from the table above. Run them in a Command Prompt opened as administrator, and make a restore point first.

Make the change · CMD

reg add "HKLM\SOFTWARE\Policies\Mozilla\Firefox" /v "DisableTelemetry" /t REG_DWORD /d 1 /f

See what it is set to now · CMD

reg query "HKLM\SOFTWARE\Policies\Mozilla\Firefox" /v "DisableTelemetry"

How to undo it

In the app: Yes

Switching it off puts back exactly what was there before, value for value.

Switch the tweak off in Frozen Tweaks. The app saved what each value was before the change and writes exactly that back, or removes the value if it did not exist.

Changing several settings at once? The app's Make a restore point button, on every plan, makes a Windows restore point before you start.

Verdict

A safe privacy setting.

Questions

What does the "Disable Firefox Telemetry" tweak change in Windows?: In the registry it sets DisableTelemetry to 1 under HKLM\SOFTWARE\Policies\Mozilla\Firefox.
Is "Disable Firefox Telemetry" safe to switch on?: A safe privacy setting. The main cost: Firefox shows that your browser is managed by policy.
How do I undo it?: Switch the tweak off in Frozen Tweaks. Switching it off puts back exactly what was there before, value for value.
Is "Disable Firefox Telemetry" free in Frozen Tweaks?: It is part of Frozen Pro and Elite. You can also make the change by hand with the values on this page.

In the app