Examine source code of footyscores extension

{
  "name": "footyscores extension",
  "version": "3.6",
  "description": "Dark mode and other theme options for SuperCoach website",
  "permissions": [
    "activeTab",
    "storage",
    "webRequest",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://supercoach.heraldsun.com.au/*",
        "https://www.supercoach.com.au/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/base.css",
    "assets/perm.css",
    "assets/darkmode.css",
    "assets/green.css",
    "assets/red.css",
    "assets/darkmodedefbg.css",
    "assets/revamped.css",
    "assets/fslogo.svg",
    "assets/new.png"
  ],
  "icons": {
    "128": "assets/icon128.png"
  },
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6db3064d-d7cb-4f00-a988-9a8373ff9d8c}"
    }
  }
}