Re-enable multi-process support disabled by Windows utilities

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  • Revision id: 245232
  • Created:
  • Creator: AliceWyman
  • Comment: added Templates: aboutconfigwarning, aboutconfig; other edits (Is this article still valid?)
  • Reviewed: Yes
  • Reviewed:
  • Reviewed by: Fabi.L
  • Is approved? Yes
  • Is current revision? Yes
  • Ready for localization: Yes
  • Readied for localization:
  • Readied for localization by: Fabi.L
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This article applies to Windows computers only.

Some accessibility tools on Windows might turn off Firefox's multi-process support. Follow these steps to re-enable it:

Warning: These instructions are for experienced Firefox users. Changing settings in the Configuration Editor (about:config) can have serious effects on your browser’s stability, security and performance.
Only proceed if you are comfortable with advanced settings and understand the potential impacts.

  1. Type about:config in the address bar and press EnterReturn.
    A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
  2. Toggle the accessibility.loadedInLastSession preference to change its value to false.
  3. Toggle the accessibility.lastLoadDate preference to reset its value to the default setting.
  4. Restart Firefox.