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

   "*": {
       "blocked_install_message": "This extension is blocked. Please contact the helpdesk for further assistance.",
       "install_sources": ["about:addons","https://addons.mozilla.org/*"],
       "installation_mode": "blocked",
       "allowed_types": ["extension"]
   },
   "rested@restedclient": {
       "installation_mode": "allowed"
   },
   "{c45c406e-ab73-11d8-be73-000a95be3b12}": {
       "installation_mode": "allowed"
   },
   "{5caff8cc-3d2e-4110-a88a-003cc85b3858}": {
       "installation_mode": "allowed"
   },
   "selenium-ide": {
       "installation_mode": "allowed"
   },
   "{a6fd85ed-e919-4a43-a5af-8da18bda539f}": {
       "installation_mode": "allowed"
   },
   "{16a49f65-1369-4839-a5ef-db2581e08b16}": {
       "installation_mode": "allowed"
   },
   "{5384767E-00D9-40E9-B72F-9CC39D655D6F}": {
       "installation_mode": "allowed"
   },
   "{83efb7a7-cf21-4f94-840a-316f651053ef}": {
       "installation_mode": "allowed"
   },
   "{edfc63b3-fc9b-4b6b-b9bf-4561ad548044}": {
       "installation_mode": "allowed"
   },
    "{f1a3d59a-f759-4d03-9545-6f741e64524e}": {
       "installation_mode": "allowed"
   },
    "cors-everywhere@spenibus": {
       "installation_mode": "allowed"
   }
}'/>

Hi, I've been struggling for a week to try and get our extensions managed in Firefox. Firstly I tried doing it in Intune through the Extension Management setting in the ADMX however that wouldn't work as it couldn't parse the JSON. Then I've tried using the OMA-URI ./Device/Vendor/MSFT/Policy/Config/Firefox~Policy~firefox~Extensions/ExtensionSettings I'm now getting a straight up error in Intune -2016281112 (0x87d1fde8). I've followed the documentation as best as I can but it still doesn't seem to work. In the Intune logs there is no record of the Config profile even being attempted. Any ideas as to what is causing this error? Here is the full code being used for the OMA-URI string: <pre><nowiki><enabled/> <data id="ExtensionSettings" value=' { "*": { "blocked_install_message": "This extension is blocked. Please contact the helpdesk for further assistance.", "install_sources": ["about:addons","https://addons.mozilla.org/*"], "installation_mode": "blocked", "allowed_types": ["extension"] }, "rested@restedclient": { "installation_mode": "allowed" }, "{c45c406e-ab73-11d8-be73-000a95be3b12}": { "installation_mode": "allowed" }, "{5caff8cc-3d2e-4110-a88a-003cc85b3858}": { "installation_mode": "allowed" }, "selenium-ide": { "installation_mode": "allowed" }, "{a6fd85ed-e919-4a43-a5af-8da18bda539f}": { "installation_mode": "allowed" }, "{16a49f65-1369-4839-a5ef-db2581e08b16}": { "installation_mode": "allowed" }, "{5384767E-00D9-40E9-B72F-9CC39D655D6F}": { "installation_mode": "allowed" }, "{83efb7a7-cf21-4f94-840a-316f651053ef}": { "installation_mode": "allowed" }, "{edfc63b3-fc9b-4b6b-b9bf-4561ad548044}": { "installation_mode": "allowed" }, "{f1a3d59a-f759-4d03-9545-6f741e64524e}": { "installation_mode": "allowed" }, "cors-everywhere@spenibus": { "installation_mode": "allowed" } }'/></nowiki></pre><br>