Firebug does not refresh cache on changed JavaScript

Question

Firebug does not refresh cache on changed JavaScript when debugging JavaScript code under script section of Firebug. It's still showing & executing old JavaScript code which I wrote 1 to 2 hours back.

Firefox version is 13.0.1.
Firebug 1.9.2.

Could anybody please suggest me how to overcome this issue? Or anyway of clearing JavaScript cache under Firebug?

Solution

When I've had this problem, I've usually restarted Firefox (close, open again), but clearing the cache using ctrl+F5 has worked too.