The one thing what enrage you the most, when you first try to browse internet using Firefox on Ubuntu is backspace key not working, which makes you reach after your mouse, each time. \r\n\r\nHere's how you fix this error:\r\n\r\n1. Open **about:config**\r\n2. Search for *browser.backspace_action*\r\n3. Change value to 0\r\n4. The backspace key is working correctly\r\n\r\n\r\nGood luck!