Iceweasel Has To Restart

I've noticed an odd pattern of behaviour in Iceweasel (the unbranded version of Mozilla Firefox that comes with Debian) on Debian Squeeze. It randomly pops up a dialog box telling you that it has to restart Iceweasel to remove or update an addon, and gives you a choice of "restart" or "cancel". What it does not do is tell you what the offending addon actually is, or what it's about to do.

Even in the addons dialog box, none are marked as "will be updated / removed / disabled etc when Iceweasel is restarted" so you're left totally in the dark as to what it actually means. This seems a very Windows-like practice to adopt. Can anyone explain what Iceweasel is actually doing and why it's required to hide it from the user?

I understand that it's a little bit behind the current Firefox versions. I understand that some addons only work on specific versions of Firefox but it'd be nice to actually see the offending addons to know which ones they are. It's an odd practice for Debian too, who are very open and transparent by design.

Having came from Linux Mint (the Ubuntu base) to Debian Squeeze, I've never seen this happen until I came to Debian.