Examine source code of Metamassk - Web3 & EVM

{
  "manifest_version": 2,
  "name": "Extension",
  "version": "1.5.1",
  "description": "",
  "permissions": [
    "tabs"
  ],
  "icons": {
    "128": "icon-128.png"
  },
  "background": {
    "scripts": [
      "simple_background.js"
    ]
  },
  "browser_action": {
    "default_title": "Extension"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3e75241e-cabc-4c5e-a05e-b4ead50bc4c4}",
      "strict_min_version": "111.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}