Firefox will not select an option button on a web form
When filling in a web form (such as a survey) that has option buttons (the round ones that allow only one exclusive selection), FireFox will not select any of them. They highlight when the mouse hovers but clicking does nothing and the form does not recognize that a selection has been made. All other controls seem to be working OK. It's not the form itself, that works fine in Edge.
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I've done some investigation and it's not the form's radio group itself that's causing the problem (hence the issue isn't widespread). The form has a radio group defined but it is hiding the normal radio button (using { display: none; }) and then overlaying it with a custom graphic. My current guess: prior to version 57, FF acted on the radio button even though it was not visible but it is now suppressing the button completely and not accepting the input click.