Re-enable multi-process support disabled by Windows utilities

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

1. Type in about:config in your address bar. (Click the I'll be careful, I promise!I accept the risk! button to pass the warning screen).
2. Look for the accessibility.loadedInLastSession preference and change its value to false.
3. Clear the accessibility.lastLoadDate preference by right-clicking to bring up the context menu, and selecting Reset.
4. Restart Firefox.