The Fennec LogView add-on has been updated to version 1.2, and it now supports Android Lollipop, Marshmallow, and above.

The previous version read directly from the Android logger device located at /dev/log/main, which worked well on Android 4.x. However, starting with Android 5.0, apps no longer have read permission to /dev/log/main. Fortunately, Android 5.0 also added several new APIs in the liblog.so library specifically for reading logs. LogView 1.2 uses these new APIs, when available, through js-ctypes, and this approach should continue to work on future versions of Android as well.