Examine source code of Mais Esports

{
  "manifest_version": 2,
  "name": "Mais Esports",
  "description": "MaisEsports extension for browser",
  "version": "1.0.0",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "MaisEspors",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f88e2a85-e52a-4a76-9fe8-5f5dbfc31500}"
    }
  }
}