Firefox, the second most popular Web browser, gives users a more streamlined interface and faster download times. An issue with the Firefox program files causes the error message "Mozilla Firefox not responding." Fortunately, every problem has a solution, and the user can take the necessary steps to restore Firefox to its original state. Firefox may freeze while downloading a file; however, cleaning the download history may resolve the issue. Firefox's location database may be damaged if a user's browser frequently crashes. And If the user is willing to lose their current history and bookmarks, they can create a new database. Also, If the user can launch Firefox, they should try disabling Hardware Acceleration.