Examine source code of Chataco

{
  "applications": {
    "gecko": {
      "id": "forumforall@forumforall.net"
    }
  },
  "manifest_version": 2,
  "icons": {
    "16": "assets/images/extension/icon_HD.png",
    "48": "assets/images/extension/icon_HD.png",
    "128": "assets/images/extension/icon_HD.png"
  },
  "name": "Chataco",
  "description": "Provides a distinct site-specific chat interface for every website you visit.",
  "version": "2018.3.9resigned1",
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "http://*/",
    "https://*/"
  ],
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "css": [
        "assets/extension/css/main.css"
      ],
      "js": [
        "js/extension.bundle.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/images/*",
    "assets/extension/css/main.css"
  ],
  "browser_action": {
    "default_icon": "assets/images/extension/icon_off.png"
  }
}