Has anyone else tried out Firefox Developer Edition?
Firefox Developer Edition is experimental and may be unstable.
I got a "lesson" in unstable today

Spent a good hour or so trying to figure out why some social links/buttons had disappeared from a site after I made some changes to the main nav (which shouldn't affect the social stuff). I couldn't get the menu to work, so deleted all the code for it and reloaded without it. Opened the site in Firefox DE and noticed the social buttons had gone missing, although they were still in the HTML and showed up fine in preview (Firefox-non developer version). All files were in place on the server.
Instantly assumed I'd messed up somewhere and went straight to Firebug (in Firefox DE)....rather than doing the obvious and checking it with another browser.
But I do like the new Firefox DE, even if I can't quite trust it yet!