To reproduce this problem, build the extension from c767c53 and use it to click on babel-polyfill at https://github.com/OctoLinker/browser-extension/blob/730815cc3656b3c96bf4435f97c5ae7eff28a3cb/lib/app.js#L1

There's a TypeError here because the function expects to receive a String, but receives a {url, method}.

I could probably just fix this myself, but I'm thinking we should probably add some more testing in to make sure this sort of thing can't happen again. @stefanbuck, what do you think?