I really am not sure at the Moment what is Apple's Trouble and what Jaws. For example, Dialog fields are titled with "modal" in Firefox 50. But I haven't been using Jaws on a 18 on a Windows Computer.
Another Thing, which is not an accessibility issue: Some Desktop Apps in Windows don't save their start Settings. Thunderbird keeps asking if I want to use it for E-Mails or News asf, even if I check not to ask me at every start. Adobe Acrobat Reader wants to set up Accessibility Settings every time I start it.
But others do. Jaws doesn't ask me for Authorisation, Microsoft Word also doesn't Need to check which Open document Format I Need.
Any Idea where to start?