A surprise bug didn't affect many people, but because it blocked Firefox from loading, Mozilla issues updates as fast as possible.
Mozilla released on Wednesday two new versions of Firefox, 3.6.10 (Windows | Mac | Linux) and 3.5.15, to deal with a surprise problem that was crashing the browser during launch.
Mozilla had released the preceding versions a week earlier but cut off downloads when the bug emerged.
The problem hadn't reared its head particularly prominently in pre-release test versions, release manager Christian Legnitto said in a bug comment.
"Interesting that this doesn't show up in the top 300 crashes in 3.6.9pre or 3.5.12pre," he said. However, he pointed out in a follow-up remark, "Though this was a spike, the overall 'crashiness' of Firefox 3.6.x has not really increased at all. At about 1k [1,000] crashes a day, this crash is a drop in the bucket vs. active daily users."
"Because it is a crash on start-up that could prevent people from using Firefox entirely, we feel it was best to get a fix out quickly," he added.