No console message and network activity when inspecting Web extension's background page

[csarven]

• git clone dokieli to local
• load dokieli as extension in debug mode / temporary (Firefox) or developer mode / load unpacked (Chrome/Brave..). In Firefox clicking on any file in the dokieli directory will load it. In Chrome/Brave click on manifest.json (don't worry about Chrome's errors "Unrecognized manifest key 'applications'.") This should introduce the dokieli icon into the browser's toolbar.
• "Inspect" the background page. This should open a dedicated console window specifically for the extension.
• go to any HTML document without dokieli already embedded, e.g., https://www.w3.org/DesignIssues/CloudStorage .
• click on the dokieli icon from the browser's toolbar. This should init dokieli into the webpage.
• interact with the webpage as usual using dokieli.

There are no console messages and network activities in Web extension's console.

This makes is very hard to debug the extension.