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Firefox v80 "MCE 7 Reset Toolbox Access Is Denied" Message

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I use "MCE Reset Toolbox" to add entry points to WMC for launching websites with Firefox.

See image 1.

The following image is of the settings I used in "MCE Reset Toolbox" for one of the entry points.

See image 2.

Everything worked fine until yesterday when I updated to the latest Firefox v80. Now whenever WMC relaunches after closing Firefox I get the "MCE 7 RESET TOOLBOX Access is denied" message in WMC.

See image 3.

I checked the Firefox release notes for v80, and it mentions that a number new permission policies have been implemented. Maybe that's what's causing the issue.

https://www.mozilla.org/en-US/firefox/80.0/releasenotes/

https://github.com/mozilla/policy-templates/blob/master/README.md#permissions

Restoring Firefox back to v79 fixes the issue.

Does anyone know what caused this issue or have any ideas how to fix it?

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