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Re:Show HN: Talk – A free video call app for the web by jumasheff on Thursday March 12, 2020 @07:08AM (#22555547)
Couldn't share my screen –– MacOS Catalina, Firefox 73.0.1

UPD: Updated Firefox to 74, still `Unable to share screen`

Re:Show HN: Talk – A free video call app for the web by vasanthv on Friday March 13, 2020 @11:17AM (#22567924)
You need to add screen recording permission for firefox. Catalina privacy restrictions.