Re-enable multi-process support disabled by Windows utilities

Firefox Firefox Last updated: 14% of users voted this helpful
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.

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These fine people helped write this article:

AliceWyman, Tonnes, ideato, Joni
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