Could you double check on a freshly created, new Studio project with Activity packages (especially UIAutomation one) fully up to date?
I verified internally that Firefox 80 is supposed to be working correctly on Studio and UIAutomation package with versions 20.8 and higher without an issue.
Updating the packages made it work 
Thanks a lot!!!
But after updating my Assistant shows “no processes available”
I’m glad it worked out. For the processes in your Assistant, please see these videos:
Studio Sign In Guides.
I have to assume it is related to how the new Studio Sing In feature behaves 
Unfortunately after having made more testing in Firefox I found that several “click” activities are not working any longer. So the error correction was only partially solving the main issue with web recorder not working and other fundamental errors.
Regarding the processes in Assistant I cannot get unattended triggers to work. It states that no machine is defined for the current folder. Please UiPath - could you provide us with some guidelines when doing major updates instead of leaving us in the dark!!! I have spent hours trying to fix my unattended triggers in addition to several hours of fixing the error with Firefox
If you have the official feed active across all these environments (might have to be configured as per our documentation), you can normally install newer packages, even on an older version of Studio.
It can be though that some new versions of packages will require a Studio update. Some examples from Package Manager:
Thanks, but the topic here is specifically about the firefox update changes to the UiAutomation package, which you have said is implemented in Communnity Edition 20.10. My question is whether this UiAutomation Package 20.10 will be made available in my paid-for non-community edition of Studio 2019.10? If not, what is my upgrade path?
I would suggest you to contact our technical support via the official channel here:
There is a few things I can think of:
