Logo fonts for Mozilla projects

From MozillaZine Knowledge Base

Mozilla used to use Revolution, made by T-26. This is no longer used as frequently on, but still can be seen on the Mozilla Cross-Reference.

Mozilla Firefox uses the Meta Bold font, made by FontFont. It is used extensively throughout (for example, on Firefox's product page). Because it's been adopted more or less as the official commercial font for Mozilla and because new Mozilla products don't have a unique typeface attached to them, other products, such as Mozilla Thunderbird, use Meta Bold too.