Doesn't work on Firefox
This was tough for us, because we're big believers in the standards-based web. We 100% promise that all the code we generate works across all browsers. Unfortunately, while most of the editor works in all browsers, getting full support is really hard. We're doing a lot of things that get pretty deep in the browser, so we wanted to lock things down as much as possible. We almost were electron-only to ensure consistenc…
Rule #1 is do feature detection not user agent detection. What are you doing that is "pretty deep in the browser"? NaCL? Experimental Chrome features?