I'm pretty sure it's triggered by certain adds which unfortunately change each time you load the page. I'll try to see what triggers it, but that can take its time as they are rather infrequent. By the way I've only ever seen this with the Ubuntu FF3 Beta 5, never with the current mozilla.org nightlies.
I'm pretty sure it's triggered by certain adds which unfortunately change each time you load the page. I'll try to see what triggers it, but that can take its time as they are rather infrequent. By the way I've only ever seen this with the Ubuntu FF3 Beta 5, never with the current mozilla.org nightlies.