Firefox about:config

The about:config page is the editor of the configuration of Firefox settings or preferences.

Tested on: Firefox 58 x64 on Windows 8.1

Preferences of Firefox

• Undo History
  • maximum undo tabs in 'Recently Closed Tabs': browser.sessionstore.max_tabs_undo
  • maximum undo windows in 'Recently Closed Windows': browser.sessionstore.max_windows_undo
• Network last updated 07Dec2018
  • Value between 1 and 255 inclusive, directly corresponding to the maximum number of HTTP keep-alive connections the application can have open at once to a single server.: Network.http.max-persistent-connections-per-server
  • Value between 1 and 65535 inclusive, directly corresponding to the maximum number of HTTP connections Mozilla can have open at once: Network.http.max-connections
  • True for keep-alive connections whenever possible: Network.http.keep-alive
• Security/Sandbox
  Reference: https://wiki.mozilla.org/Security/Sandbox
  
  Sandbox Feature Level 0 Level 1 Level 2 Level 3 Level 4 Job Level JOB_NONE JOB_NONE JOB_INTERACTIVE JOB_RESTRICTED JOB_LOCKDOWN Access Token Level USER_NON_ADMIN USER_NON_ADMIN USER_INTERACTIVE USER_LIMITED USER_LIMITED Alternate Desktop no no no no YES Alternate Windows Station no no no no no Initial Integrity Level INTEGRITY_LEVEL_MEDIUM INTEGRITY_LEVEL_LOW INTEGRITY_LEVEL_LOW INTEGRITY_LEVEL_LOW INTEGRITY_LEVEL_LOW Delayed Integrity Level INTEGRITY_LEVEL_MEDIUM INTEGRITY_LEVEL_LOW INTEGRITY_LEVEL_LOW INTEGRITY_LEVEL_LOW INTEGRITY_LEVEL_LOW Mitigations None MITIGATION_BOTTOM_UP_ASLR
  MITIGATION_HEAP_TERMINATE
  MITIGATION_SEHOP
  MITIGATION_DEP_NO_ATL_THUNK
  MITIGATION_DEP MITIGATION_BOTTOM_UP_ASLR
  MITIGATION_HEAP_TERMINATE
  MITIGATION_SEHOP
  MITIGATION_DEP_NO_ATL_THUNK
  MITIGATION_DEP MITIGATION_BOTTOM_UP_ASLR
  MITIGATION_HEAP_TERMINATE
  MITIGATION_SEHOP
  MITIGATION_DEP_NO_ATL_THUNK
  MITIGATION_DEP
  MITIGATION_EXTENSION_POINT_DISABLE MITIGATION_BOTTOM_UP_ASLR
  MITIGATION_HEAP_TERMINATE
  MITIGATION_SEHOP
  MITIGATION_DEP_NO_ATL_THUNK
  MITIGATION_DEP
  MITIGATION_EXTENSION_POINT_DISABLE
  MITIGATION_IMAGE_LOAD_NO_REMOTE
  MITIGATION_IMAGE_LOAD_NO_LOW_LABEL Delayed Mitigations None MITIGATION_STRICT_HANDLE_CHECKS
  MITIGATION_DLL_SEARCH_ORDER MITIGATION_STRICT_HANDLE_CHECKS
  MITIGATION_DLL_SEARCH_ORDER MITIGATION_STRICT_HANDLE_CHECKS
  MITIGATION_DLL_SEARCH_ORDER MITIGATION_STRICT_HANDLE_CHECKS
  MITIGATION_DLL_SEARCH_ORDER