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How to Disable E10s using Environment Variable MOZ_FORCE_DISABLE_E10S - 1

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I need to disable E10s. It causes Firefox 68,0 (32bit) to display a Blank Page when Firefox is closed and I launch a Web Page from my Email Client. I have to have Firefox open first now before clicking on a Website url from the Email Client. This was the same problem I had two or more years ago when E10s was first implemented. I disabled it back then in about:config but Mozilla have disabled that option in Firefox 68. It's stated you can disable E10s using Environment Variable MOZ_FORCE_DISABLE_E10S - 1 but I'm not sure where to use that. I put it in my Windows 10 Environment Variables (System Properties/Environment Variables) but it did not work. I am using Windows 10 32-bit (Both Pro and Home) and the problem exists on all computers since upgrading to Firefox 68.0. I need to disable E10s again.

I need to disable E10s. It causes Firefox 68,0 (32bit) to display a Blank Page when Firefox is closed and I launch a Web Page from my Email Client. I have to have Firefox open first now before clicking on a Website url from the Email Client. This was the same problem I had two or more years ago when E10s was first implemented. I disabled it back then in about:config but Mozilla have disabled that option in Firefox 68. It's stated you can disable E10s using Environment Variable MOZ_FORCE_DISABLE_E10S - 1 but I'm not sure where to use that. I put it in my Windows 10 Environment Variables (System Properties/Environment Variables) but it did not work. I am using Windows 10 32-bit (Both Pro and Home) and the problem exists on all computers since upgrading to Firefox 68.0. I need to disable E10s again.
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Firefox/68.0

More Information

cor-el
  • Top 10 Contributor
  • Moderator
17422 solutions 157414 answers

Note that the proper syntax to use in a .cmd file to start Firefox is:

  • set MOZ_FORCE_DISABLE_E10S=1

You need to set the environment variable to 1


Note that the proper syntax to use in a .cmd file to start Firefox is: *set MOZ_FORCE_DISABLE_E10S=1 You need to set the environment variable to 1 ---- *https://dxr.mozilla.org/mozilla-release/source/toolkit/xre/nsAppRunner.cpp#5067
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