Ah, null browsercontext isn't allowed - https://hg.mozilla.org/mozilla-central/diff/d6c5410fc2859ce35774009947841ce7a68f1711/uriloader/exthandler/nsExternalHelperAppService.cpp#l1.15 Can we allow that when we just want it to open externally?
Bug 1637826 Comment 5 Edit History
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Ah, null browsingContext isn't allowed - https://hg.mozilla.org/mozilla-central/diff/d6c5410fc2859ce35774009947841ce7a68f1711/uriloader/exthandler/nsExternalHelperAppService.cpp#l1.15 Can we allow that when we just want it to open externally?