Bug? Information disclosure

Open a website in a tab, then press control-B to open bookmarks and
double-click a bookmark to visit the site in the existing active tab.
The URL of the existing page will be sent to the bookmarked site as
the referrer. This could be potentially embarrassing or politically
dangerous. :P

Is it a MultiZilla bug or seamonkey? I reported a very similar bug in
MultiZilla a few years ago, which HJ fixed immediately, so I suspect
it's maybe happening again in MultiZilla somewhere.

I'm using:
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8.1.17) Gecko/20080924
MultiZilla/1.8.3.5i SeaMonkey/1.1.12

Thanks,
Paul