@chai2,
Oops, Chai. Paranoia strikes again.. (song to follow)
I finally found a website that mentions this as a problem of safari. (I wonder if I saved that? I think so).
It does happen if you hover over the bookmarks and let go when the cursor is not over bookmark. Sometimes. Christ on a jaloppy.
Sorry.
I've probably had it happen twenty times over the years.
The mac intensifies all this with the sound effects, as implied in the title. Lost data irretrievable, per that website, whatever it was.
It turned out that my second whoosh loss of the day was yahoo, easy to get back, and I virtually always get a2k back. But, sigh, I've previously lost flogs (food blogs) and travel and art.
I know the answer is to export stuff to Delicious or other such site. I'm working on it.
So, I need to activate Firefox.