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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.

Restoring Firefox back to v79 fixes the issue.

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

Attached screenshots

Modified by Keylonta

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