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Firefox checkbox accessibility problem with keyboard navigation

We're seeing an accessibility problem with how Firefox keyboard navigation works with checkbox elements.  The expected key to changed the checked state is spacebar:

However in Firefox, this rapidly cycles the checkbox state between checked and unchecked with just one spacebar press, which creates an accessibility problem for keyboard users (they're forced to use the enter key, which is unexpected).


Here's my test system info:

  • Firefox Version 80.0.1
  • Build ID 20200831163820
  • User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:80.0) Gecko/20100101 Firefox/80.0
  • OS Windows_NT 10.0 19041

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