I have the plugin installed (in the build section), but, in my app cordova.InAppBrowser is undefined. I have tried with both the debugger version (custom build debugger) and also in the release version.
You must call any APIs of a Cordova plugin within “deviceready” event which signals that Cordova’s device APIs have loaded and are ready to access…
They will appear “undefined” if you call them before they are completely loaded. Also, please make sure you call each API properly.