Duplicate and solved see [/questions/955809#answer-424756] The requirements for the latest version of Firefox for Android states at least 384 MB of RAM and at least a QVGA screen resolution. . Why is the LG Optimus. e400 still unsupported when it meets all of the requirements? It has 384 MB of RAM and has a QVGA screen, but I cannot download and install it from the Play Store. Please explain why this is, and please fix it.