Filter unsupported file types per default

[mschlicht-tt]

Problem

Currently, unsupported file types (.txt, .json, etc) are listet in the popup. Those files are not supported for diffing, but the buttons are shown.

Suggestion

• Only list supported files as all files are allready shown on the actual page that is opened in the browser tab.
• Check for a more explicit filtering based on the current browser tab - Is a specific file selected? This file should be listet first, for example.

Example of current state