I have retested the issue on the following devices: Samsung Galaxy S6 (Android 6.0.1), Samsung Galaxy Tab Active (Android 5.1.1), Nexus 7 (Android 5.1.1) and LG G3 (Android 4.4.2). On Firefox the issue occurs only on Samsung Galaxy S6 (Android 6.0.1) and Samsung Galaxy Tab Active (Android 5.1.1). Regarding Fenix I was unable to load the test page from Comment 7, however I used the video http://techslides.com/demos/sample-videos/small.mp4 both in Firefox and Fenix when reaching the end of the video the error message "Video can't be played because the file is corrupt" and the same error message as mentioned in comment 6 is generated but only on the Samsung Galaxy S6 (Android 6.0.1) and Samsung Galaxy Tab Active (Android 5.1.1) devices. In short the issue does affect older versions of Android 6.0 but only on Samsung devices and it affects both Firefox and Fenix.
Bug 1565838 Comment 10 Edit History
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I have retested the issue on the following devices: Samsung Galaxy S6 (Android 6.0.1), Samsung Galaxy Tab Active (Android 5.1.1), Nexus 7 (Android 5.1.1) and LG G3 (Android 4.4.2). On Firefox the issue occurs only on Samsung Galaxy S5 (Android 6.0.1) and Samsung Galaxy Tab Active (Android 5.1.1). Regarding Fenix I was unable to load the test page from Comment 7, however I used the video http://techslides.com/demos/sample-videos/small.mp4 both in Firefox and Fenix when reaching the end of the video the error message "Video can't be played because the file is corrupt" and the same error message as mentioned in comment 6 is generated but only on the Samsung Galaxy S6 (Android 6.0.1) and Samsung Galaxy Tab Active (Android 5.1.1) devices. In short the issue does affect older versions of Android 6.0 but only on Samsung devices and it affects both Firefox and Fenix.