Re: Extension won't work in Qlik Sense Desktop app
I can't see anything in your extension that should not work in the built-in browser in Qlik Sense Desktop. Most likely your problem is caused by the pretty agressive caching made in Qlik Sense Desktop. If you use it for development you don't really know what version of your code you are running.
This is one of the reasons the built-in browser in Qlik Sense Desktop is not suited for extension development. Another is that it is built on an old version of chrome and Qlik has historically been pretty bad at updating it. Even if they improve that it will always lag behind the browser on your PC, since there is no auto-update. I have written about this here: