If they're seeing Mozilla logo somewhere, they're either on the Mozilla website or a webpage regarding Mozilla or a product thereof, so all this discussion is in vain and is a parody of itself.
Also, WRT indexing, the logo is an image, not text, so the search engines will either not index it or index it like they index other images, using filename and maybe embedded metadata.
> they're either on the Mozilla website or a webpage
or they've seen a sticker on a laptop. Or they've seen a t-shirt, or skimmed a magazine article. And they're now googling it, and ending up on moz.com.