Examine source code of RockingMiles

{
  "manifest_version": 2,
  "name": "RockingMiles",
  "version": "2.0",
  "content_scripts": [
    {
      "js": [
        "browser-polyfill.js",
        "dompurify.js",
        "main.js"
      ],
      "matches": [
        "*://*.rocketmiles.com/*"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "rockingmiles@kaioelfke.de"
    }
  },
  "page_action": {
    "browser_style": true,
    "default_popup": "popup.html",
    "show_matches": [
      "*://*.rocketmiles.com/*"
    ]
  }
}