Now that Firefox 57 is in the stable channel, many users aren't going to take the drastic step of reverting to ESR and recreating their profiles from scratch only to have to suck it up in a few months once 59 becomes ESR. The real problem is that browser.warnOnQuit is used in the algorithm for determining when to show an alert but is undiscoverable. It might be a better idea to walk the user through use of browser.warnOnQuit.
Now that Firefox 57 is in the stable channel, many users aren't going to take the drastic step of reverting to ESR and recreating their profiles from scratch only to have to suck it up in a few months once 59 becomes ESR. The real problem is that
browser.warnOnQuitis used in the algorithm for determining when to show an alert but is undiscoverable. It might be a better idea to walk the user through use ofbrowser.warnOnQuit.