{ config, pkgs, firefox-addons, ... }:

let
  autoconfigCfg = pkgs.writeText "autoconfig.cfg" ''
    var {classes:Cc,interfaces:Ci,utils:Cu} = Components;
    /* set new tab page */
    try {
      ChromeUtils.defineESModuleGetters(this, {
        AboutNewTab: "resource:///modules/AboutNewTab.sys.mjs",
      });
      var newTabURL = "https://mainframe.local/mainframe.html";
      AboutNewTab.newTabURL = newTabURL;
    } catch(e){Cu.reportError(e);} // report errors in the Browser Console
  '';

  autoconfigJs = pkgs.writeText "autoconfig.js" ''
    pref("general.config.filename", "autoconfig.cfg");
    pref("general.config.obscure_value", 0);
    pref("general.config.sandbox_enabled", false);
  '';

  firefoxWithAutoconfig = pkgs.firefox.overrideAttrs (oldAttrs: {
    buildCommand = oldAttrs.buildCommand + ''
      # Copy autoconfig files to the Firefox installation
      cp ${autoconfigJs} $out/lib/firefox/defaults/pref/autoconfig.js
      cp ${autoconfigCfg} $out/lib/firefox/autoconfig.cfg
    '';
  });

in {
  config = {
    home-manager.users.${config.user} = { pkgs, ... }: {
      programs.firefox = {
        enable = true;
        package = firefoxWithAutoconfig;
        profiles.default = {
          settings = {
            "browser.startup.homepage"                                               = "https://mainframe.local/mainframe.html";
            "sidebar.verticalTabs"                                                   = true;
            "extensions.activeThemeID"                                               = "firefox-compact-dark@mozilla.org";
            "browser.contentblocking.category"                                       = { Value = "strict"; Status = "locked"; };
            "toolkit.telemetry.server"                                               = "127.0.0.1";
            "toolkit.telemetry.server_owner"                                         = "localhost";
            "extensions.pocket.enabled"                                              = false;
            "extensions.screenshots.disabled"                                        = true;
            "browser.topsites.contile.enabled"                                       = false;
            "browser.formfill.enable"                                                = false;
            "browser.search.suggest.enabled"                                         = false;
            "browser.search.suggest.enabled.private"                                 = false;
            "browser.urlbar.suggest.searches"                                        = false;
            "browser.urlbar.showSearchSuggestionsFirst"                              = false;
            "browser.newtabpage.activity-stream.feeds.section.topstories"            = false;
            "browser.newtabpage.activity-stream.feeds.snippets"                      = false;
            "browser.newtabpage.activity-stream.section.highlights.includePocket"    = false;
            "browser.newtabpage.activity-stream.section.highlights.includeBookmarks" = false;
            "browser.newtabpage.activity-stream.section.highlights.includeDownloads" = false;
            "browser.newtabpage.activity-stream.section.highlights.includeVisited"   = false;
            "browser.newtabpage.activity-stream.showSponsored"                       = false;
            "browser.newtabpage.activity-stream.system.showSponsored"                = false;
            "browser.newtabpage.activity-stream.showSponsoredTopSites"               = false;

          };
          extensions.packages = with firefox-addons; [
            noscript
            ublock-origin
            sponsorblock
          ];
        };
        policies = {
          DisableTelemetry          = true;
          DisableFirefoxStudies     = true;
          EnableTrackingProtection = {
            Value                   = true;
            Locked                  = true;
            Cryptomining            = true;
            Fingerprinting          = true;
          };
          DisablePocket             = true;
          DisableFirefoxAccounts    = true;
          DisableAccounts           = true;
          DisableFirefoxScreenshots = true;
          OverrideFirstRunPage      = "";
          OverridePostUpdatePage    = "";
          DontCheckDefaultBrowser   = true;
          DisplayBookmarksToolbar   = "never"; # alternatives: "always" or "newtab"
          DisplayMenuBar            = "default-off"; # alternatives: "always", "never" or "default-on"
          SearchBar                 = "unified"; # alternative: "separate"
        };
      };
    };
  };
}