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@Mte90 /ff-check.js
Last active Mar 23, 2017

What would you like to do?
Check if Firefox/Firefox OS/Firefox for Android
//With locationbar.visible check if not in a webview (like an open web app)
if (locationbar.visible) {
//mozApps used for the open web app and with the user agent check if have MObile (used in Firefox OS)
if (navigator.userAgent.indexOf('Firefox') > -1 && navigator.userAgent.indexOf("Mobile") > -1) {
//Check Firefox OS
} else if (navigator.userAgent.indexOf('Firefox') > -1 && navigator.userAgent.indexOf("Android") > -1) {
//Check Firefox for Android
} else if (navigator.userAgent.indexOf("Firefox") > -1) {
//Check Firefox Desktop

beware of operators precedence
!!"mozApps" in navigator
equals to
'true' in navigator

From the description in MDN it seems that this code would take all Android devices using Firefox as using Firefox OS.

Unfortunately this does not work for Android 7 / Firefox.

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