My WordPress 4.4.1 site uses the widgets from plugins Collapsing Archives and Collapsing Categories
I can’t make those widgets work with Franz Josef.
There is no output, and the Developer view in Chrome doesn’t show any error messages.
I haven’t yet been able to figure out what the problem is.
The Collapsing widgets work fine with the Graphene theme.
Other themes that also work with those widgets include Twenty Sixteen, Twenty Fifteen, Toivo, Responsive, Simone and GovPress