The node program (puppeteer) and/or the agent itself, will close Firefox brutaly
in some cases. So that when we reopen Firefox, the safe mode popup will be shown,
asking the user if he prefers to start in safe mode.
But that break the automation as we expect Firefox to be opening the browser window as usual.
Differential Revision: https://phabricator.services.mozilla.com/D31992
--HG--
extra : moz-landing-system : lando
