Bolt Box said:
"Choose default apps by protocol" ... the default app as desired.
Only because your list contained FF . Same list as in Default apps page. You did not have the problem that is treated in this thread.

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Skodd said:
still doesn't show as an option the Settings Default App
I made my desired browser, missing from the list, go into the list by modifying registry entries according to those shown by Kolbicz in blog. You get credit for putting it to our attention.