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. [http://example.com https://www.mozilla.org/en-US/firefox/80.0/releasenotes/] [http://example.com 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?