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One-line summary
Original PR moved from bedrock
My attempt at fixing the a11y issues brought up in the original issue. It extends off of mozilla/bedrock#15293 which I thought was 99% of a solution and worth exploring further. I have not kept the history from Rob Hudson's original commit.
Significant changes and points to review
This change focuses the header of the active step after the innerHTML is set. This ensures the focus only occurs when the user is navigating through the steps, and not on a full page load.
In mozilla/bedrock#15293 the #installer-help and #browser-help modals were not working, due to the innerHTML being set and losing all attached listeners. Now after the innerHTML is set the modal listeners are re-attached.
I did not bring a sr-only changes over.
Issue / Bugzilla link
mozilla/bedrock#15082
Testing
see mozilla/bedrock#16172