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No of course not!
The exploit was in TWiki and not in the Mozilla software, as could be read.
But you didn't follow the links, did you?
The developers are concentrating on the software and not the website (pretty common for most projects - even proprietary projects).
"The exploit was in TWiki and not in the Mozilla software, as could be read. "
Maybe we all should be discussing the security of perl based Wikis?