Examine source code of QueerDarkMode

{
  "manifest_version": 2,
  "name": "QueerDarkMode",
  "version": "0.2.0",
  "description": "Dark design for the social network DBNA",
  "icons": {
    "128": "icon.png",
    "256": "icon256.png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "js": [
        "js/inject.js"
      ],
      "matches": [
        "https://www.dbna.com/*"
      ]
    }
  ],
  "browser_action": {
    "default_title": "QueerDarkMode",
    "default_icon": {
      "128": "icon.png",
      "256": "icon256.png"
    },
    "default_popup": "html/popup.html"
  },
  "web_accessible_resources": [
    "css/*.css",
    "html/*.html"
  ],
  "permissions": [
    "storage"
  ]
}