Question about a Firefox Update

Yesterday the update popped up to download, said it was important, blah blah. I began to download it but stopped when I saw where it said the license was unknown.

It just popped up again, looked legit, until it popped up license unknown. It aid if any question to go directly to Firefox for the update. Well I did yesterday but don't know what I'm looking for. No snide comments, please!

Anyone here download this update, and familiar with this saying unknown license? Is it safe or not?