We have a new way of configuring preferences using JSON that should work for many of those:

https://github.com/mozilla/policy-templates/blob/master/README.md#preferences

A lot of those pref names are incorrect (_ instead of .)

You should check about:config for the correct names.

Thank you for your response Mike. I did check JSON file and configured preferences but none of them are working as expected.

Can you post the JSON you used for your preferences?

Tried with different combinations. OMA-URI --> ./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/Preferences JSON

<enabled/> <data id="JSON" value=' {

 "geo.enabled": {
   "Value": false,
   "Status": "default"
 },
 "security.mixed_content.block_active_content": {
   "Value": false,
 }
 }'/>

tried with geo_enabled and security_mixed_content_block_active_content with no luck

You have an extra comma after

"Value": false,

and that one is missing the Status type (we don't do a status by default)

I run my JSON through JSONlint.com to verify it is correct.

I'll still do some checking with intune to make sure this is working, my comments are from a first glance.

Did fixing those typos make it work for you?

I have tried with removing the comma but it didn't work.

I just ran a quick test and this is working for me.

Can you post a screenshot of your Configuration settings in intune?

I'm wondering if somehow the old preferences are conflicting with the new preferences?

Hi Mike, since it didn't work through Intune, I have deleted Intune profile and deployed the settings using config file. Can you please share your configuration settings in Intune so that I will also test with the same set of configurations and revert you with the results?

Sure.

I created an entry called Firefox ADMX with the OMA-URI

./Device/Vendor/MSFT/Policy/ConfigOperations/ADMXInstall/Firefox/Policy/FirefoxAdmx.

And a type of string and pasted the entirety of:

https://raw.githubusercontent.com/mozilla/policy-templates/master/windows/firefox.admx

Then I created an entry called Preferences with an OMA-URI of:

./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox/Preferences

Data type is string and value is:

<enabled/> <data id="JSON" value=' {

"geo.enabled": {
  "Value": false,
  "Status": "default"
},
"security.mixed_content.block_active_content": {
  "Value": false
}
}'/>

Then after saving and deploying, the preferences were set in the registry.