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Firefox consumes a lot of CPU resources when "access to accesibility services is forbidden" is disabled

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This problem occured on the latest firefox update on windows 10. I noticed that my CPU usage was high up when I had two tabs open with YouTube and a news site. I have an intel core i7 with eight threads and firefox used consistently 25% percent as reported by windows task manager. To find the problem I started firefox in safe mode, to make sure that it had nothing to do with my add-ons. In safe mode firefox still casued my laptop to overheat. I searched the internet for a solution and someone mentioned the accesibility services. Indeed, firefox has by default disabled the option "access to accesibility services is forbidden". So I toggled this option and since my problem has been solved, I wonder what would've caused this? What was firefox doing when this option was disabled? Perhaps more users are affected by this issue. I hope that I've given enough detail. I tried to look at about:memory, but I couldn't pinpoint the problem there.

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Hi treebird:

I think this very well documented in our Firefox Knowledge Base at:

https://support.mozilla.org/en-US/kb/accessibility-services

If it isn't what are we missing?

Cheers! ...Roland

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Note that the "Help -> Troubleshooting Information" (about:support) page has a section about accessibility and, if active, shows what application is using it .