I'm a native English speaker and had no idea it was meant to be particularly funny or hip; I just assumed it was done kind of in-joke, common enough in FOSS. But it didn't seem very confusing since the next line explains: "We couldn't find any bugs matching your search terms. You could try searching with fewer or different terms."
In-Jokes are only ever going to be funny for those within that group; that's pretty much what defines them. Since I'm not in any Mozilla hacking group I wouldn't know whether it's so, or just a bit of silliness, but either way it doesn't add more than a one-time bump.
