Last modified: 2014-06-28 15:42:39 UTC
VisualEditor crashes when you try to save if the Defaultsummaries gadget is enabled. (https://en.wikipedia.org/wiki/MediaWiki:Gadget-defaultsummaries.js ) This is new; it used to work. Workaround: Disable the gadget. (Might be Firefox-specific. I haven't tested it.)
Not really a VE bug, but here you go: The gadget is using ve.init.mw.targets[0] to access the target, which isn't supposed to be a public API yet, but hey. This was removed recently and is now accessible via ve.init.mw.target.