malfunctioning.technology is humming along nicely! Fixed a few more issues in ServiceWorker, including mistaken caching of 40x/50x error pages and Firefox breaking on redirected caches (not Firefox's fault; they are following the spec and Chrome will match them in v59). Still more work to do: https://github.com/tootsuite/mastodon/pull/3052
Thanks to those testing; if you want to get in on ServiceWorker/AppCache testing, check out https://malfunctioning.technology/