Examine source code of FPL Away Kits

{
  "name": "FPL Away Kits",
  "browser_specific_settings": {
    "gecko": {
      "id": "matthewverster05@gmail.com",
      "strict_min_version": "54.0"
    }
  },
  "version": "1.0.4",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://fantasy.premierleague.com/*"
      ],
      "js": [
        "Content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "description": "A tool to access other shirts on FPL - if a player is playing away, they play in their away shirt!"
}