How to detect Android's version number in Firefox for Android?
android, detection, firefox, javascript, user-agent
Solution
Unfortunately, you cannot. See Bug 625238 - Add device info to User-Agent and the related Bug 807495 - User Agent does not include handset Device Model.
In general, Mozilla has a policy of not adding User Agent (or HTTP header) information, and they currently have the opinion that developers do not need to know the running Android version.
Problem
For a website we want to show a link in the play store if the user comes with an Android 4+ device. All browsers we tested sent the version number of Android in their user-agent string, except one: Firefox for Android. Firefox just sends this: ``` Mozilla/5.0 (Android; Mobile; rv:19.0) Gecko/19.0 Firefox/19.0 ``` and even with some JavaScript I can't find any evidence for the version number: ``` <script language="JavaScript"> document.write(navigator.appVersion + "\n<br/>OS CPU: " + navigator.oscpu); </script> ``` returns: ``` 5.0 (Android) OS CPU: Linux arm7l ``` Did I miss some other methods?