When I use Firefox, I use CTRL key combinations to cut, copy, paste, and delete. I also use F5 to refresh a webpage. Firefox uses many, many other key combinations and hotkeys, and a great number of them have caused the instant erasure of all the hours of work I had done on a webpage: The browser jumps to another tab, or it goes fullscreen (one of the Function keys does this), or it opens a new window, or it opens a History window, or it does any number of things which I neither want nor need. I require only to use the key combinations and hotkeys to perform the functions that I have listed, above. But if I must sacrifice them in an overall disable, then I will do so. Please tell me how to disable the key combination commands and hotkeys in Firefox.