Examine source code of FPL Time Machine

{
  "manifest_version": 3,
  "name": "FPL Time Machine",
  "version": "0.1",
  "description": "Roll back some of the recent 'improvements' to the FPL website.",
  "icons": {
    "16": "images/fpl_gup_icon16.png",
    "32": "images/fpl_gup_icon32.png",
    "48": "images/fpl_gup_icon48.png",
    "128": "images/fpl_gup_icon128.png"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://fantasy.premierleague.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "loader.css",
        "images/retro_pitch.jpg"
      ],
      "matches": [
        "https://fantasy.premierleague.com/*"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fpl-time-machine@coinboi.protonmail.com",
      "strict_min_version": "109.0"
    }
  }
}