So the idea of this post is to do the same thing described here

We will use the last js value from arkenfox and this will automatically install ublock origin at launch (like librewolf)

  1. Install firefox
  2. Delete your firefox profile if you have one (i think deleting the AppVM then re-create it might be better just in case)
  3. nano /etc/firefox/policies/policies.json
{
  "policies": {
    "Extensions": {
      "Install": [
        "https://addons.mozilla.org/firefox/downloads/file/4629131/ublock_origin-1.68.0.xpi"
      ],
      "Locked": [
        "ublockorigin@raymondhill.net"
      ]
    },
    "Preferences": {
      "browser.startup.page": 0,
      "browser.startup.homepage": "chrome://browser/content/blanktab.html",
      "browser.newtabpage.enabled": false,
      "browser.newtabpage.activity-stream.showSponsored": false,
      "browser.newtabpage.activity-stream.telemetry.privatePing.enabled": false,
      "browser.newtabpage.activity-stream.telemetry.privatePing.redactNewtabPing.enabled": false,
      "browser.newtabpage.activity-stream.showSponsoredTopSites": false,
      "browser.newtabpage.activity-stream.showSponsoredCheckboxes": false,
      "browser.newtabpage.activity-stream.default.sites": "",
      "geo.provider.use_geoclue": false,
      "extensions.getAddons.showPane": false,
      "extensions.htmlaboutaddons.recommendations.enabled": false,
      "browser.discovery.enabled": false,
      "browser.newtabpage.activity-stream.feeds.telemetry": false,
      "browser.newtabpage.activity-stream.telemetry": false,
      "app.shield.optoutstudies.enabled": false,
      "app.normandy.enabled": false,
      "app.normandy.api_url": "",
      "breakpad.reportURL": "",
      "browser.tabs.crashReporting.sendReport": false,
      "browser.crashReports.unsubmittedCheck.autoSubmit2": false,
      "captivedetect.canonicalURL": "",
      "network.captive-portal-service.enabled": false,
      "browser.safebrowsing.downloads.remote.enabled": false,
      "network.prefetch-next": false,
      "network.dns.disablePrefetch": true,
      "network.dns.disablePrefetchFromHTTPS": true,
      "network.predictor.enabled": false,
      "network.predictor.enable-prefetch": false,
      "network.http.speculative-parallel-limit": 0,
      "browser.places.speculativeConnect.enabled": false,
      "network.proxy.socks_remote_dns": true,
      "network.file.disable_unc_paths": true,
      "network.gio.supported-protocols": "",
      "browser.urlbar.speculativeConnect.enabled": false,
      "browser.urlbar.quicksuggest.enabled": false,
      "browser.urlbar.suggest.quicksuggest.nonsponsored": false,
      "browser.urlbar.suggest.quicksuggest.sponsored": false,
      "browser.search.suggest.enabled": false,
      "browser.urlbar.suggest.searches": false,
      "browser.urlbar.trending.featureGate": false,
      "browser.urlbar.addons.featureGate": false,
      "browser.urlbar.amp.featureGate": false,
      "browser.urlbar.fakespot.featureGate": false,
      "browser.urlbar.mdn.featureGate": false,
      "browser.urlbar.weather.featureGate": false,
      "browser.urlbar.wikipedia.featureGate": false,
      "browser.urlbar.yelp.featureGate": false,
      "browser.formfill.enable": false,
      "browser.search.separatePrivateDefault": true,
      "browser.search.separatePrivateDefault.ui.enabled": true,
      "signon.autofillForms": false,
      "signon.formlessCapture.enabled": false,
      "network.auth.subresource-http-auth-allow": 1,
      "browser.cache.disk.enable": false,
      "browser.privatebrowsing.forceMediaMemoryCache": true,
      "media.memory_cache_max_size": 65536,
      "browser.sessionstore.privacy_level": 2,
      "toolkit.winRegisterApplicationRestart": false,
      "browser.shell.shortcutFavicons": false,
      "security.ssl.require_safe_negotiation": true,
      "security.tls.enable_0rtt_data": false,
      "security.OCSP.enabled": 1,
      "security.OCSP.require": true,
      "security.cert_pinning.enforcement_level": 2,
      "security.remote_settings.crlite_filters.enabled": true,
      "security.pki.crlite_mode": 2,
      "dom.security.https_only_mode": true,
      "dom.security.https_only_mode_send_http_background_request": false,
      "security.ssl.treat_unsafe_negotiation_as_broken": true,
      "browser.xul.error_pages.expert_bad_cert": true,
      "network.http.referer.XOriginTrimmingPolicy": 2,
      "privacy.userContext.enabled": true,
      "privacy.userContext.ui.enabled": true,
      "media.peerconnection.ice.proxy_only_if_behind_proxy": true,
      "media.peerconnection.ice.default_address_only": true,
      "dom.disable_window_move_resize": true,
      "browser.download.start_downloads_in_tmp_dir": true,
      "browser.helperApps.deleteTempFileOnExit": true,
      "browser.uitour.enabled": false,
      "devtools.debugger.remote-enabled": false,
      "permissions.manager.defaultsUrl": "",
      "network.IDN_show_punycode": true,
      "pdfjs.disabled": false,
      "pdfjs.enableScripting": false,
      "browser.tabs.searchclipboardfor.middleclick": false,
      "browser.contentanalysis.enabled": false,
      "browser.contentanalysis.default_result": 0,
      "security.csp.reporting.enabled": false,
      "browser.download.useDownloadDir": false,
      "browser.download.alwaysOpenPanel": false,
      "browser.download.manager.addToRecentDocs": false,
      "browser.download.always_ask_before_handling_new_types": true,
      "extensions.enabledScopes": 5,
      "extensions.postDownloadThirdPartyPrompt": false,
      "browser.contentblocking.category": "strict",
      "privacy.sanitize.sanitizeOnShutdown": true,
      "privacy.clearOnShutdown_v2.cache": true,
      "privacy.clearOnShutdown_v2.historyFormDataAndDownloads": false,
      "privacy.clearOnShutdown_v2.browsingHistoryAndDownloads": false,
      "privacy.clearOnShutdown_v2.downloads": false,
      "privacy.clearOnShutdown_v2.formdata": true,
      "privacy.clearOnShutdown_v2.cookiesAndStorage": true,
      "privacy.clearSiteData.cache": true,
      "privacy.clearSiteData.cookiesAndStorage": false,
      "privacy.clearSiteData.historyFormDataAndDownloads": false,
      "privacy.clearSiteData.browsingHistoryAndDownloads": false,
      "privacy.clearSiteData.formdata": true,
      "privacy.clearHistory.cache": true,
      "privacy.clearHistory.cookiesAndStorage": false,
      "privacy.clearHistory.historyFormDataAndDownloads": false,
      "privacy.clearHistory.browsingHistoryAndDownloads": false,
      "privacy.clearHistory.formdata": true,
      "privacy.sanitize.timeSpan": 0,
      "privacy.window.maxInnerWidth": 1600,
      "privacy.window.maxInnerHeight": 900,
      "DisableFirefoxStudies": true,
      "privacy.resistFingerprinting.block_mozAddonManager": true,
      "privacy.spoof_english": 1,
      "widget.non-native-theme.use-theme-accent": false,
      "browser.link.open_newwindow": 3,
      "browser.link.open_newwindow.restriction": 0,
      "extensions.blocklist.enabled": true,
      "network.http.referer.spoofSource": false,
      "security.dialog_enable_delay": 1000,
      "privacy.firstparty.isolate": false,
      "extensions.webcompat.enable_shims": true,
      "security.tls.version.enable-deprecated": false,
      "extensions.webcompat-reporter.enabled": false,
      "extensions.quarantinedDomains.enabled": true,
      "datareporting.policy.dataSubmissionEnabled": false,
      "datareporting.healthreport.uploadEnabled": false,
      "toolkit.telemetry.unified": false,
      "DisableTelemetry": true,
      "toolkit.telemetry.enabled": false,
      "toolkit.telemetry.server": "data:,",
      "toolkit.telemetry.archive.enabled": false,
      "toolkit.telemetry.newProfilePing.enabled": false,
      "toolkit.telemetry.shutdownPingSender.enabled": false,
      "toolkit.telemetry.updatePing.enabled": false,
      "toolkit.telemetry.bhrPing.enabled": false,
      "toolkit.telemetry.firstShutdownPing.enabled": false,
      "toolkit.telemetry.coverage.opt-out": true,
      "toolkit.coverage.opt-out": true,
      "toolkit.coverage.endpoint.base": "",
      "browser.startup.homepage_override.mstone": "ignore",
      "browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons": false,
      "browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features": false,
      "browser.urlbar.showSearchTerms.enabled": false

    },
      "LockedPreferences": {
      "DisableTelemetry": true,
      "toolkit.telemetry.unified": false,
      "toolkit.telemetry.enabled": false,
      "toolkit.telemetry.server": "data:,",
      "toolkit.telemetry.archive.enabled": false,
      "toolkit.telemetry.newProfilePing.enabled": false,
      "toolkit.telemetry.shutdownPingSender.enabled": false,
      "toolkit.telemetry.updatePing.enabled": false,
      "toolkit.telemetry.bhrPing.enabled": false,
      "toolkit.telemetry.firstShutdownPing.enabled": false,
      "toolkit.telemetry.coverage.opt-out": true,
      "toolkit.coverage.opt-out": true,
      "toolkit.coverage.endpoint.base": ""
    }

  }
}
  1. CTRL+o / CTRL +x
  2. Done now each time you will launch firefox it will start with the arkenfox values

Warning ! For some unknow reason some telemetry stay enable depsite my effort to turn them off i didn't find why they stay enable.. such as "Send technical and interaction data to Mozilla" "Firefox studies" "Send daily usage ping to Mozilla"

As you can see i disabled telemetry by using "DisableTelemetry" in the json file but in about:config some telemetry like "toolkit.telemetry.unified true" are still enable if someone know how to fix this in the policies.json let me know.