User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0 Build ID: 20120420145725 Steps to reproduce: I am tryed to update firefox from 11.0 to 12.0 through it's menu. Actual results: After restarting it i caught an error something like "there is one more copy in your memory". I restarted my PC (windows 7 64 bit) and get the same message. Firefox didn't want to update. Expected results: I have installed my copy of firefox into RAMdrive therefore there was a little space on it. After increasing it's space Firefox successfully updated. I propoose before updating to check is there enough space for it.

The actual error message: "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again."

Dup'ing to the bug to add free space checks.