I have tried both adaptive and marketplace, but when I click icon screen goes blank. Pressing Home key is only way out.
After reading the information provided about your issue I suggest a soft reset of the phone.
Please report back to us if this solved your problem!
No change on reset. When the app icon is clicked there is simply a blank screen, reloading does nothing, back button does nothing. Only way is long press Home button.
Both Facebook and Twitter open without a problem.
I'm sorry you're having this problem with LinkedIn on Firefox OS. Thanks for this report. I will look into this more (I can reproduce this on my ZTE Open) so I have filed a bug on it https://bugzilla.mozilla.org/show_bug.cgi?id=908925