Examine source code of Clet

{
  "name": "Clet",
  "description": "The ultimate blockchain name service!",
  "version": "1.3",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "https://api.clet.domains/api/v1/*"
  ],
  "browser_action": {
    "default_popup": "/popup.html",
    "default_icon": {
      "16": "/images/logo16.png",
      "32": "/images/logo32.png",
      "48": "/images/logo48.png",
      "128": "/images/logo128.png"
    },
    "default_title": "Clet"
  },
  "icons": {
    "16": "/images/logo16.png",
    "32": "/images/logo32.png",
    "48": "/images/logo48.png",
    "128": "/images/logo128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{29bc2bd7-ff2c-4dd0-bdd9-aed6dde09aa0}"
    }
  }
}