I use the mouse button 4 to control a background application (Push To Talk functionality) while using Firefox. How can i unbind the "back" functionality of mouse button 4? (FYI i dont use any special driver software. Standard Microsoft driver for HID-conform Mice is active). The solution mentionend here: https://support.mozilla.org/en-US/questions/1008310 does not help, since it does not change the behaviour of firefox at all. Firefox seems to ignore that configuration entry.