in Production Mode everything is fine. When i change to Developer Mode i have this Problem
because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.
So i start the php bin/magento setup:static-content:deploy and everthing is fine frontend and backend.
The Problem is: when i login to my backend, i dont have developer rights. I cant see developer configuration and when i change something on my theme it does not apply the changes.
So what do i do wrong ?