Mozilla Firefox as we know is basically known as an efficient web browser, which lets you view any information or perform any necessary tasks that you need to do.In other words, it let you conduct a smooth internet session. Due to its sophisticated algorithm it is compatible with most of the operating systems available in the market i.e. Windows, OSX, Linux, Android, iOS etc. But this web browser is not able to perform to its fullest every time.It does show some unusual issues which can hinder while you are operating on the web browser. One of the common issues that occur in a Mozilla Firefox browser is its black out problem in which the whole browser window turns out black.