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Disable Firefox default browser and system data reporting

Overview​

About this script

This script improves your privacy on Windows.

These changes use Windows system commands to update your settings.

This script disables the Firefox Default Browser Agent. The agent collects and sends information about the user's default browser to Mozilla 1 Disabling it halts the transmission of details such as the currently set default browser, the previous one, and the operating system's locale and version number 2 3.

This enhances privacy by preventing browser preferences and usage data from being shared with Mozilla.

The script configures HKLM\SOFTWARE\Policies\Mozilla\Firefox!DisableDefaultBrowserAgent registry key to prevent the Default Browser Agent from taking any actions 4.

This script uses Batch (batchfile) scripting language.

Safe for General Use

This script is recommended for all users. It helps to improve privacy without affecting stability.

Implementation Details

  • Language: batch

  • Required Privileges: Administrator rights

  • Compatibility: Windows only

  • Reversibility: Can be undone using provided revert script

Explore Categories​

This action belongs to Configure Firefox category. This category provides scripts for enhancing Firefox privacy by limiting data shared with Mozilla. Read more on category page ▶

Apply now​

Choose one of three ways to apply:

  1. Automatically via privacy.sexy: The easiest and safest option.
  2. Manually by downloading: Requires downloading a file.
  3. Manually by copying: Advanced flexibility.

Alternative 1. Apply with Privacy.sexy​

privacy.sexy is free and open-source application that lets securely apply this action easily.

Open privacy.sexy

You can fully restore this action (revert back to the original behavior) using the application.

privacy.sexy instructions
  1. Open or download the desktop application
  2. Search for the script name: Disable Firefox default browser and system data reporting.
  3. Check the script by clicking on the checkbox.
  4. Click on Run button at the bottom of the page.

Alternative 2. Download​

Irreversible Changes

This script is irreversible, meaning there is no straightforward method to restore changes once applied. Exercise caution before running, restoring it may not be possible.

  1. Download the script file by clicking on the button below:

    Download script

  2. Run the script file by clicking on it.

Download revert script​

This file restores your system to its original state, before this script is applied.

Download restore script

Alternative 3. Copy​

This is for advanced users. Consider automatically applying or downloading the script for simpler way.

  1. Open Command Prompt as administrator.
HELP: Step-by-step guide

  1. Click on Start menu

  2. Type cmd

  3. Right click on Command Prompt select Run as administrator

  4. Click on Yes to run Command Prompt

Animation showing how to open terminal as administrator on Windows 11

  1. Copy the following code:
Code to apply changes
:: Set the registry value: "HKLM\SOFTWARE\Policies\Mozilla\Firefox!DisableDefaultBrowserAgent"
PowerShell -ExecutionPolicy Unrestricted -Command "$registryPath = 'HKLM\SOFTWARE\Policies\Mozilla\Firefox'; $data = '1'; reg add 'HKLM\SOFTWARE\Policies\Mozilla\Firefox' /v 'DisableDefaultBrowserAgent' /t 'REG_DWORD' /d "^""$data"^"" /f"
  1. Right click on command prompt to paste it.
  2. Press Enter to apply remaining code.

Copy restore code​

Copy and run the following code to restore changes:

Revert code
:: Delete the registry value "HKLM\SOFTWARE\Policies\Mozilla\Firefox!DisableDefaultBrowserAgent"
PowerShell -ExecutionPolicy Unrestricted -Command "reg delete 'HKLM\SOFTWARE\Policies\Mozilla\Firefox' /v 'DisableDefaultBrowserAgent' /f 2>$null"

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