Examine source code of Music Stats Tracker

{
  "manifest_version": 2,
  "name": "Music Stats Tracker",
  "version": "1.0",
  "description": "Track and visualize your favorite music habits!",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{772776e7-dd3e-4c95-b73c-423fd9999013}"
    }
  }
}