Re-enable multi-process support disabled by Windows utilities

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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.

These fine people helped write this article:

AliceWyman, Tonnes, ideato, Joni
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