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Your version of Firefox may be using the multiprocess feature already. Follow these instructions to make sure:
- Type about:support in your address bar.
- In Multiprocess Windows, if the number is higher than zero (0), you already have the multiprocess feature activated.
If the number is zero (0), follow these instructions to turn it on:
- Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click to continue to the about:config page.
- Search for browser.tabs.remote.autostart and double-click on the preference to set its value to true.
- Restart Firefox to enable multiprocess.