Hmm it works for me:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.14) Gecko/20110124 Ubuntu/10.04 (lucid) Firefox/3.6.14
At least, I can manipulate the time okay. If there is a way to make it revert to current time (without loading the page), I don't see it.
Hmm it works for me:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.14) Gecko/20110124 Ubuntu/10.04 (lucid) Firefox/3.6.14
At least, I can manipulate the time okay. If there is a way to make it revert to current time (without loading the page), I don't see it.