I think I got the wrong end of the stick. I thought you meant replacing the BL site, but I guess you meant the BL app. I haven't used the app because I don't really get the point of it. In this case, I think Cake will make a great alternative to the app for more serious users, but I reckon the app will probably remain for basic users and mobile use.
I also get the Chrome reference now too. I expect you have to use Chrome only because it is the only browser that has all the advanced features working correctly that are required for the app. Chrome is Google's rebranded version of the open source Chromium browser. Chromium is usually one or two iterations ahead of Chrome. So you could try using Chromium and it should work.