Examine source code of Click2CallOVH

{
  "description": "Extension Click2Call pour votre ligne VOIP OVH!",
  "manifest_version": 2,
  "name": "Click2Call.OVH",
  "short_name": "C2C.OVH",
  "version": "1.4.2.26resigned1",
  "background": {
    "scripts": [
      "jquery.min.js",
      "sha512.js",
      "config.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "css": [
      "bootstrap.min.css"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "jquery.min.js",
        "config.js",
        "content.js"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "https://www.c2c.ovh/*"
    ]
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "clipboardRead",
    "contextMenus",
    "storage",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{401eaf45-9f15-4656-ba4c-5d0b1237fbdf}"
    }
  }
}