We’ve reported beginning with Firefox 68 you can no longer disable Multi-Process or e10s in Firefox browser. The about:config pref browser. which you’ve used before for that purpose will be removed or won’t work if you set its value to false. But Mozilla still allows developers to disable electrolysis in Firefox browser by setting an environment variable in Windows, let us see how we can do that.
Disabling e10s or multi-process in Firefox
1. Right-click on My Computer icon on the desktop, select properties or open run dialog and type “sysdm.cpl” and press enter
2. Click Advanced System Settings,
3. Click Environment Variables
4. Under User Variables, click on New and enter variable name and value as below
Variable name: MOZ_FORCE_DISABLE_E10S
Variable value: 1
5. Click on OK thrice to apply the changes.
6. If Firefox is open, restart the browser
7. After relaunch, click on Help > Troubleshooting information and look for “Multiprocess Windows” entry under Application Basics, it will show “disabled forcibly” to confirm Firefox is running in a single process.
You can also verify that by looking at the Processes tab in Task Manager.
Note: Do this only if you’ve strong reasons to turn off the multi-process architecture and do note, the company already confirmed there is a chance of New Tab Page breaking as a result. Thanks to our reader Motox 22a for reminding about the environment variable.
