{
  /*** [SECTION 1000]: CACHE / SESSION (RE)STORE / FAVICONS
       Cache tracking/fingerprinting techniques [1][2][3] require a cache. Disabling disk (1001)
       *and* memory (1003) caches is one solution; but that's extreme and fingerprintable. A hardened
       Temporary Containers configuration can effectively do the same thing, by isolating every tab [4].

       We consider avoiding disk cache (1001) so cache is session/memory only (like Private Browsing
       mode), and isolating cache to first party (4001) is sufficient and a good balance between
       risk and performance. ETAGs can also be neutralized by modifying response headers [5], and
       you can clear the cache manually or on a regular basis with an extension.

       [1] https://en.wikipedia.org/wiki/HTTP_ETag#Tracking_using_ETags
       [2] https://robertheaton.com/2014/01/20/cookieless-user-tracking-for-douchebags/
       [3] https://www.grepular.com/Preventing_Web_Tracking_via_the_Browser_Cache
       [4] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21
       [5] https://github.com/arkenfox/user.js/wiki/4.2.4-Header-Editor
  ***/
  /** CACHE ***/
  /* 1001: disable disk cache
   * [SETUP-PERF] If you think disk cache may help (heavy tab user, high-res video),
   * or you use a hardened Temporary Containers, then feel free to override this
   * [NOTE] We also clear cache on exiting Firefox (see 2803) ***/
  "browser.cache.disk.enable" = false;
  /* 1003: disable memory cache
   * capacity: -1=determine dynamically (default), 0=none, n=memory capacity in kibibytes ***/
  #   // user_pref("browser.cache.memory.enable", false);
  #   // user_pref("browser.cache.memory.capacity", 0);
  /* 1006: disable permissions manager from writing to disk [RESTART]
   * [NOTE] This means any permission changes are session only
   * [1] https://bugzilla.mozilla.org/967812 ***/
  #   // user_pref("permissions.memory_only", true); // [HIDDEN PREF]
  /* 1007: disable media cache from writing to disk in Private Browsing
   * [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB
   * [SETUP-WEB] ESR78: playback might break on subsequent loading (1650281) ***/
  "browser.privatebrowsing.forceMediaMemoryCache" = true;  # [FF75+]
  "media.memory_cache_max_size" = 65536;

  /** SESSIONS & SESSION RESTORE ***/
  /* 1020: exclude "Undo Closed Tabs" in Session Restore ***/
  #   // user_pref("browser.sessionstore.max_tabs_undo", 0);
  /* 1021: disable storing extra session data [SETUP-CHROME]
   * define on which sites to save extra session data such as form content, cookies and POST data
   * 0=everywhere, 1=unencrypted sites, 2=nowhere ***/
  "browser.sessionstore.privacy_level" = 2;
  /* 1022: disable resuming session from crash ***/
  #   // user_pref("browser.sessionstore.resume_from_crash", false);
  /* 1023: set the minimum interval between session save operations
   * Increasing this can help on older machines and some websites, as well as reducing writes [1]
   * Default is 15000 (15 secs). Try 30000 (30 secs), 60000 (1 min) etc
   * [SETUP-CHROME] This can also affect entries in the "Recently Closed Tabs" feature:
   * i.e. the longer the interval the more chance a quick tab open/close won't be captured.
   * This longer interval *may* affect history but we cannot replicate any history not recorded
   * [1] https://bugzilla.mozilla.org/1304389 ***/
  "browser.sessionstore.interval" = 30000;
  /* 1024: disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS]
   * [1] https://bugzilla.mozilla.org/603903 ***/
  "toolkit.winRegisterApplicationRestart" = false;

  /** FAVICONS ***/
  /* 1030: disable favicons in shortcuts
   * URL shortcuts use a cached randomly named .ico file which is stored in your
   * profile/shortcutCache directory. The .ico remains after the shortcut is deleted.
   * If set to false then the shortcuts use a generic Firefox icon ***/
  "browser.shell.shortcutFavicons" = false;
  /* 1031: disable favicons in history and bookmarks
   * Stored as data blobs in favicons.sqlite, these don't reveal anything that your
   * actual history (and bookmarks) already do. Your history is more detailed, so
   * control that instead; e.g. disable history, clear history on close, use PB mode
   * [NOTE] favicons.sqlite is sanitized on Firefox close, not in-session ***/
  #   // user_pref("browser.chrome.site_icons", false);
  /* 1032: disable favicons in web notifications ***/
  #   // user_pref("alerts.showFavicons", false); // [DEFAULT: false]
}