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

Posted: Thu Aug 27, 2020 6:33 am
by Keylonta
I use "MCE Reset Toolbox" to add entry points to WMC for launching websites with Firefox.

Website Entry Points.jpg

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

MCE Reset Toolbox Settings.jpg

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.

MCE Reset Toolbox Message.jpg
MCE Reset Toolbox Message.jpg (16.1 KiB) Viewed 1618 times

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

https://www.mozilla.org/en-US/firefox/8 ... easenotes/

https://github.com/mozilla/policy-templ ... ermissions


Restoring Firefox back to v79 fixes the issue.

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

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

Posted: Sun Aug 30, 2020 2:33 pm
by JediDwight
You might try Waterfox Classic. Mozilla has removed many benefits Firefox has had in recent years. Waterfox has been around as a 64-bit build of Firefox many years now. It retains many since-removed features, including the ability to use Classic Theme Restorer, and older plugins.

https://www.waterfox.net/download/

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

Posted: Mon Aug 31, 2020 7:08 am
by Keylonta
Thanks JediDwight, much appreciated. I've been trying to get the Brave browser to work too but I get the same "Access is Denied" message when WMC is relaunched. But for some reason, if I first launch WMC from within MCE Reset Toolbox using the WMC icon on the ribbon, then the "Access is Denied" message doesn't show.

2020-08-31 17_19_31-MCE Reset Toolbox.jpg
2020-08-31 17_19_31-MCE Reset Toolbox.jpg (9.43 KiB) Viewed 1525 times

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

Posted: Sat Sep 05, 2020 10:47 pm
by Shadow Lord
I can confirm the same issue with on a brand new install using Win 8.1/WMC and Firefox 80. Interestingly, Firefox 80 works fine on Windows 7 WMC with entry point setup using Media Center Studio.

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

Posted: Mon Sep 07, 2020 9:36 am
by Shadow Lord
Shadow Lord wrote:
Sat Sep 05, 2020 10:47 pm
I can confirm the same issue with on a brand new install using Win 8.1/WMC and Firefox 80. Interestingly, Firefox 80 works fine on Windows 7 WMC with entry point setup using Media Center Studio.
I just also did a new install with Win 7 SP1 and Firefox 80 works fine with entry points made with Reset Tool Box. So it seems to be a combination of Reset Toolbox, Win 8.x or higher, and Firefox 80.