I just consistently get the following on Firefox
TypeError: verifier is not a function TypeError: verifier is not a functionAnd a pull request fixing it was submitted back in August: https://github.com/jhusain/learnrx/pull/27
Edit: I've found it, it's curiously related to the "which browser" discussion(!): https://news.ycombinator.com/item?id=8475210 (Posted from the Firefox this time!)