"*": {
   "blocked_install_message": "My Message",
   "install_sources": ["https://addons.mozilla.org/"],
   "installation_mode": "blocked",
   "allowed_types": ["locale", "extension"]
 },
 "uBlock0@raymondhill.net": {
   "installation_mode": "force_installed",
   "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi",
   "default_area": "navbar"
 },
 "TreeTabs@jagiello.it": {
   "installation_mode": "force_installed",
   "install_url": "https://addons.mozilla.org/firefox/downloads/latest/tree-tabs/latest.xpi"
 }

 "*": {
   "blocked_install_message": "My Message",
   "install_sources": ["https://addons.mozilla.org/"],
   "installation_mode": "blocked",
   "allowed_types": ["locale", "extension"]
 },
 "uBlock0@raymondhill.net": {
   "installation_mode": "force_installed",
   "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi",
   "default_area": "navbar"
 },
 "TreeTabs@jagiello.it": {
   "installation_mode": "allowed",
   "install_url": "https://addons.mozilla.org/firefox/downloads/latest/tree-tabs/latest.xpi"
 }

Hello I have installed german Firefox Version 117.0 (Build-ID 20230824132758) on Windows 10. The following ExtensionSettings policy works as expected. The addons ublock and TreeTabs are both installed automatically. --------------- { "*": { "blocked_install_message": "My Message", "install_sources": ["https://addons.mozilla.org/"], "installation_mode": "blocked", "allowed_types": ["locale", "extension"] }, "uBlock0@raymondhill.net": { "installation_mode": "force_installed", "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi", "default_area": "navbar" }, "TreeTabs@jagiello.it": { "installation_mode": "force_installed", "install_url": "https://addons.mozilla.org/firefox/downloads/latest/tree-tabs/latest.xpi" } } --------------- But I don't want '''TreeTabs''' to be installed automatically on all workstations. So I want to change installation_mode to allowed. --------------- { "*": { "blocked_install_message": "My Message", "install_sources": ["https://addons.mozilla.org/"], "installation_mode": "blocked", "allowed_types": ["locale", "extension"] }, "uBlock0@raymondhill.net": { "installation_mode": "force_installed", "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi", "default_area": "navbar" }, "TreeTabs@jagiello.it": { "installation_mode": "allowed", "install_url": "https://addons.mozilla.org/firefox/downloads/latest/tree-tabs/latest.xpi" } } --------------- But with this setting I'm unable to install it manually from [https://addons.mozilla.org/de/firefox/addon/tree-tabs/ https://addons.mozilla.org/de/firefox/addon/tree-tabs/] The message "An unexpected error occurred during installation." and a popup with the "blocked_install_message" "My Message" is displayed. '''The same error occurs without the line (and the comma)''' "install_url": "https://addons.mozilla.org/firefox/downloads/latest/tree-tabs/latest.xpi" I don't know why this does not work. Please help. Thank you.

     "*": {
       "blocked_install_message": "My Message",
       "installation_mode": "blocked"
     },
     "uBlock0@raymondhill.net": {
       "installation_mode": "force_installed",
       "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi",
       "default_area": "navbar"
     },
     "TreeTabs@jagiello.it": {
       "installation_mode": "allowed"
     }
    }