[jaywalk]

I had a bunch of open tabs in Safari, and typing "old" (space) not only crashed Safari but got rid of almost all of the open tabs. It was all stuff I needed to refer back to, and yeah that's not a great way to manage stuff like that. Of course bookmarks would be the right way. But now it's gone.

So be careful.

[bombcar]

That's actually an interesting datapoint, it means Safari is crashing so hard it flushes the tab storage; normally "killing" (especially a background kill) Safari won't do that.