FF 34.0.5, linux
Sad! I was thrilled to mouse through the VisualEditor -> Insert Media -> Upload dialog, but it seemed to hang before I even pressed Save. The barbershop bar has been chugging for a few minutes now. This is a very small png file, 39kB.
From the JS console,
"JavaScript parse error: Parse error: Unexpected token; token 3 expected in file 'MediaWiki:Gadget-ajaxrecentchanges.js' on line 100"