Examine source code of Discador uTech

{
  "manifest_version": 3,
  "name": "Discador uTech",
  "description": "Extensão click to call para o PBX da uTech",
  "version": "1.0.7",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "contextMenus",
    "menus",
    "management"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ee17ff09-f308-4614-a313-d45e102a300a}"
    }
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "./src/popup/popup.html",
    "default_icon": "./public/images/discador-icone.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "public/images/discador-logo.png",
        "public/images/discador-icone.png",
        "src/contentScript/main.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "./public/images/discador-icone.png",
    "32": "./public/images/discador-icone.png",
    "48": "./public/images/discador-icone.png",
    "64": "./public/images/discador-icone.png",
    "128": "./public/images/discador-icone.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./src/contentScript/contentScript.js"
      ],
      "css": [
        "./src/contentScript/main.css"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "./src/background/background.js"
    ]
  }
}