Examine source code of Destiny2 Code Redeemer

{
  "manifest_version": 2,
  "name": "Destiny2 Code Redeemer",
  "version": "2.0",
  "description": "Automatically redeems Destiny 2 codes on Bungie.net",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.bungie.net/7/*/Codes/Redeem",
        "https://www.bungie.net/7/*/Codes/Redeem*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "destiny2-code-redeemer@zeliongg.github.io",
      "strict_min_version": "58.0"
    }
  }
}