Bug 959358 - [Search] Everything.me app do not launch
bug 952707

* Ensure error-message is visible and has been set before testing for presence of message.

r=gaye
Merge pull request #15171 from nullaus/bug952707-about-net-error-orange

bug 952707
Merge pull request #15276 from KevinGrandon/bug_959358_eme_apps_launch

Bug 959358 - [Search] Everything.me app do not launch r=me
Bug 957769 - dont allow multiple scans