Because aurora release update once or twice in a day.:)

Aurora is not say a single build of Firefox as you may have thought. It is the name of one of the development channels.

Development before then Nightly->Aurora->Beta->Then Release channel. When Firefox 10.0 is released the 11.0a2 will move/merge from Aurora to Beta channel.

Aurora gets patches that can happen every day and sometimes have gaps of two or three days in between as updates only happens when there are checkins. The Nightly get checkins frequently enough that it is pretty much each day and sometimes has a respin in same day.

Aurora is not really meant for regular Firefox users but for testers and for those who understand that it gets updates often.

Before and after a update type about: in the Location (address) bar and you will see that there is a new build date. There were updates on Dec 29, 30 and 31 also.

Your UA at present Mozilla/5.0 (Windows NT 5.1; rv:11.0a2) Gecko/20111228 Firefox/11.0a2

After update today it would be Mozilla/5.0 (Windows NT 5.1; rv:11.0a2) Gecko/20120101 Firefox/11.0a2

Thanks James. I use the latest stable release of Firefox mostly. When I use Aurora sometimes, I think of myself as a guinea pig and then tell the Aurora doctor what I felt when he does something. Yeh, sometimes it is hit :-) or miss as in this case :-(.

Again, your answer is most appreciated.

Thanks Swarnava, I am surprised that voluntary workers work that hard :).