policies.json

{
  "policies": {
    "DisableAppUpdate": true,
    "Homepage": {
      "URL": "about:newtab"
     },
 
  "Preferences": {
     "browser.policies.loglevel": {
      "Value": "debug",
      "Status": "locked"
    },
      "browser.tabs.warnOnClose": {
        "Value": true,
        "Status": "default"
      },
       "browser.uidensity": {
	        "Value": 1
        },
        "browser.tabs.inTitlebar": {
	        "Value": 1
        },
        "browser.tabs.firefox-view":{
                "Valie": false
        },
       "browser.uiCustomization.state": {
              "placements": {
                  "widget-overflow-fixed-list":[],
                  "unified-extensions-area":["_contain-facebook-browser-action","idcac-pub_guus_ninja-browser-action","french-gc_grammalecte_net-browser-action"],
                  "nav-bar":["back-button","forward-button","stop-reload-button","home-button","customizableui-special-spring1","urlbar-container","customizableui-special-spring2","save-to-pocket-button","zoom-controls","print-button","downloads-button","fxa-toolbar-menu-button","ublock0_raymondhill_net-browser-action"],
                  "toolbar-menubar":["menubar-items"],"TabsToolbar":["tabbrowser-tabs","new-tab-button","alltabs-button"],
                  "PersonalToolbar":["personal-bookmarks"]},
                  "seen":["developer-button","ublock0_raymondhill_net-browser-action","_contain-facebook-browser-action","idcac-pub_guus_ninja-browser-action","french-gc_grammalecte_net-browser-action"],
                  "dirtyAreaCache":["nav-bar","PersonalToolbar","unified-extensions-area","TabsToolbar"],"currentVersion":19,"newElementCount":4} 
    },
 
   "DisableProfileImport": true,
 
   "Bookmarks": [
      {
        "Title": "Le Point du FLE",
        "URL": "https://lepointdufle.net",
        "Favicon": "https://lepointdufle.net/favicon.ico",
        "Placement": "toolbar" ,
        "Folder": "FLE"
      },
       {
        "Title": "Le Point du FLE",
        "URL": "https://www.francaisfacile.com",
        "Favicon": "https://www.anglaisfacile.com/favicon.ico",
        "Placement": "toolbar" ,
        "Folder": "FLE"
      }     
    ],
 
    "DisablePocket": true,
    "DisableTelemetry": true,
 
    "FirefoxHome": {
      "Search": true,
      "TopSites": false,
      "SponsoredTopSites": false,
      "Highlights":  false,
      "Pocket":  false,
      "SponsoredPocket":  false,
      "Snippets": false,
      "Locked": false 
    },
 
    "NoDefaultBookmarks": true,
 
    "OfferToSaveLogins": false,
 
     "OverrideFirstRunPage": "",
     "OverridePostUpdatePage": "",
     "UserMessaging": {
        "WhatsNew": false,
        "ExtensionRecommendations": false,
        "FeatureRecommendations": false,
        "UrlbarInterventions": false,
        "SkipOnboarding": true,
        "MoreFromMozilla":false
      },
 
     "DisableFeedbackCommands": true,
     "DisableFirefoxAccounts": true,
     "DisableBuiltinPDFViewer": true,
 
     "SanitizeOnShutdown": true,
     "DisableFormHistory": true,
     "PasswordManagerEnabled": true,
      "DisableMasterPasswordCreation": true,
      "EnableTrackingProtection": {
          "Value": true,
          "Locked": true,
          "Cryptomining": true,
          "Fingerprinting": true
     },
 
     "ShowHomeButton": true,
 
     "RequestedLocales": ["fr-FR", "fr"],
     "PromptForDownloadLocation": true,
     "UseSystemPrintDialog": true,
 
     "Extensions": {
      "Install": ["https://addons.mozilla.org/firefox/downloads/latest/dictionnaire-francais1",	    
                  "https://addons.mozilla.org/firefox/downloads/latest/facebook-container",
                  "https://addons.mozilla.org/firefox/downloads/latest/grammalecte-fr",
                  "https://addons.mozilla.org/firefox/downloads/latest/istilldontcareaboutcookies"]
    },
 
    "ExtensionSettings" : {
          "uBlock0@raymondhill.net": {
          "installation_mode": "normal_installed",
           "install_url": "https://addons.mozilla.org/firefox/downloads/latest/ublock-origin/latest.xpi"
           }
    },
 
    "3rdparty": {
      "Extensions": {
        "uBlock0@raymondhill.net": {
          "adminSettings": {
            "selectedFilterLists": [
              "ublock-privacy",
              "ublock-badware",
              "ublock-filters",
	      "ublock-badlists",
              "user-filters",
	      "ublock-quick-fixes",
	      "ublock-abuse",
              "ublock-unbreak",
	      "adguard-generic",
	      "adguard-mobile",
	      "easylist",
	      "adguard-spyware",
	      "adguard-spyware-url",
	      "block-lan",
	      "easyprivacy",
	      "urlhaus-1",
	      "curben-phishing",
	      "curben-pup",
	      "adguard-annoyance",
	      "adguard-social",
	      "fanboy-thirdparty_social",
	      "fanboy-cookiemonster",
	      "fanboy-annoyance",
	      "fanboy-social",
	      "ublock-social",
	      "dpollock-0",
	      "plowe-0",
	      "ara-0",
	      "DEU-0",
	      "FRA-0"
            ]
          }
        }
      }
    }
 
  }
}

pour débuger si besoin

  "Preferences": {
    "browser.policies.loglevel": {
      "Value": "debug",
      "Status": "locked"
    },