Current situation (Firefox for Android):
If I go to settings -> "Open links in apps", I can choose between (1) Always, (2) Ask before opening, (3) Never.
Current problem:
I trust certain apps, and other apps I don't trust.
Desired situation:
If I go to settings--> "Open links in apps", I can also choose option (4) Only certain apps (choose).
And then I can choose which apps Firefox will always allow to open links in app.