Earlier quoted context omitted.
Logos fall more in the realm of graphic design rather than typography. They're an avatar thus logos don't necessarily need to be readable - albeit there is a modern trend to use the company name in an interesting typeface as their logo. However there are plenty of examples where a company logo contains no text what-so-ever - including Mozilla's previous logo[1]. So I wouldn't get too hung up on its typographic design…
You dont remember when people got confused and always called Mozilla 'red dinosaur head' because the logo was confusing?
Mozilla could do with an actual logo, something that fits with the Thunderbird & Firefox logos.
Edit: Having looked at the other designs I think they chose correctly, but perhaps needed a "none of the above" option. This https://blog.mozilla.org/opendesign/now-for-the-fun-part/#co... gets closer.
Perhaps they wanted something that worked just using text, I guess. Maybe 2017 will be the year of leet-speak on the desktop!?!