I'm just now getting back to upgrading my app (SubFire), and in the time since I last worked on it, my stick upgraded to the new O/S, and with it, Web App Tester seems to have also upgraded. Currently it is runtime 3.08 - RialtoAndroidCordovaWebAppTester-184.108.40.206.
If it matters, this is the navigator.userAgent of the WebAppTester, if you need it to refine what version I'm at: Mozilla/5.0 (Linux; Android 5.1.1; AFTM Build/LVY48F; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/49.0.2623.105 Mobile Safari/537.36 cordova-amazon-fireos/3.4.0 AmazonWebAppPlatform/3.4.0;2.0
As I enable the devtools and bring them up into Chrome (58.0, but it is failing on Canary 61 as well, on OSX), the inspectors seem to work and I can see console logs. However, when I go to the command line in order look at global variables (like trying to see what the userAgent is now so I know what bugfixes in the audio tag might be there) and test-invoke functions before finishing up the UI for them, I find I can not hit 'enter'. I can type all I want, but hitting enter just adds a new line to what i'm typing. Nothing I can do seems to want to submit the command to get an result.
While it isn't impossible to work around this (by adding hot-reloading and a lot of console logs), it is certainly very frustrating.