Examine source code of to shekel

{
  "manifest_version": 2,
  "name": "To Shekel",
  "version": "1.0.2",
  "permissions": [
    "*://*/*",
    "contextMenus",
    "storage"
  ],
  "browser_action": {
    "default_icon": "img/logo.svg",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "background": {
    "page": "bg.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d656e4fc-3845-4b5d-81b7-5bf7ca85475b}"
    }
  }
}