T 23, Workaround Browser Hang

Question

T 23, Workaround Browser Hang.
T 23, 2647-2TU,640MB ram.
Linux based OS
Question: Which keystroke(s) combinations will close a (or all) browser program(s) screen(s) without the use of the mouse? Did a little research on this and found that Alt+F4 might work, but did not.
Symptoms: My browser in combination with my OS hangs. This could be the result of insufficient memory. Or many other combinations of problems.
What actually happens: Mouse and graphics freeze but keyboard is functional.
What I would like to do: Need a easy quick simple 1 or 2 step browser closing via the terminal.
My hope: Not to have to reboot computer and by closing down the browser my mouse will start functioning again.
I am aware this would be a temporary work around and I am in process of solving the root cause. But note this happens completely at random Ref1. For computers, the restore button may be a hardware button, found on some laptop computers. Ref 2:
What worked: Alt+Ctrl+F1 which put me into a terminal command mode which required a whole series of logging in's and rebooting the computer. Lengthy.
Will indicate which answer is successful.
Thank You,
Bob
Ref 1:https://code.google.com/p/chromium/issues/detail?id=235414
Ref 2: http://www.computerhope.com/jargon/r/restoreb.htm
Ref 3: http://forums.lenovo.com/t5/T61-and-prior-T-series-ThinkPad/T23-2647-GGU-Recovery-Issues/td-p/28149 ---General

Answer 1

Does it hang with other browsers?