I've been using it to import stats from chummer5 files through GET requests, then messing around with DOM element creation hooking to find the char sheets and fill it in with this new data. It's very unreliable but works fairly well when it does and broke fairly recently, perhaps because of a slight change to the webpage structure. It would be extremely nice if we could do stuff like intercept the chat before it's sent to run JS macros or directly access variables in the character journals/sheets in some capacity.