There is only XUL!
replyLong dead. Now there is no XUL, only (private user) data (that Mozilla sells for revenue)
replyI think they're making a Ghostbusters joke, btw
replyMozilla made the joke themselves, about Firefox. "There is no data, there is only XUL" was an official XUL catchphrase. But now there is no XUL, and Mozilla sells private user data, so it's reversed.
replyAlso, Firebug showed what was possible with developer tools. Inspecting elements or network requests or whatever else wasn't really a thing before that extension.
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