Initial setup

1. Download the latest release from our GitHub page and unzip the file.
2. Open the file firefox.admx in an editor.
3. Sign in to Microsoft Intune at https://intune.microsoft.com.
4. Click Devices then Configuration (https://intune.microsoft.com/#view/Microsoft_Intune_DeviceSettings/DevicesMenu/~/configuration).
5. Click Create on the Policies tab and then New Policy.
6. Select Windows 10 and Later as the platform and Templates as the profile. Click Custom and then click Create.
7. Type Firefox Configuration or any descriptive name.
8. Enter an optional description.
9. Click Next.
10. Click Add.
11. Enter a name like Firefox ADMX.
12. Enter an optional description.
13. For the OMA-URI, enter ./Device/Vendor/MSFT/Policy/ConfigOperations/ADMXInstall/Firefox/Policy/FirefoxAdmx.
14. Select String for the Data type.
15. Copy all of the text from the firefox.admx file into the Value field.
16. Click Add.

Adding individual policies

1. Sign in to Microsoft Endpoint Manager at https://endpoint.microsoft.com.
2. Click Devices then Configuration (https://intune.microsoft.com/#view/Microsoft_Intune_DeviceSettings/DevicesMenu/~/configuration).
3. Click on the profile you created earlier.
4. Click Edit (next to Configuration Settings).
5. Click Add.
6. Enter an OMA-URI for the policy you want to change.
7. Enter the value for the policy you want to change.
8. Click Add.

All of the OMA-URIs and values for Firefox policies are listed at:
https://mozilla.github.io/policy-templates/