Examine source code of Reopen in Private

{
  "manifest_version": 2,
  "version": "5.0.19",
  "name": "Reopen in Private",
  "description": "__MSG_cj_i18n_07536__",
  "author": "Jeurissen Apps",
  "homepage_url": "https://apps.jeurissen.co/reopen-in-private",
  "developer": {
    "name": "Jeurissen Apps",
    "url": "https://apps.jeurissen.co/"
  },
  "incognito": "spanning",
  "default_locale": "en",
  "content_security_policy": "default-src 'none'; child-src 'none'; connect-src 'none'; font-src 'none'; frame-src 'none'; manifest-src 'none'; media-src 'none'; object-src 'none'; worker-src 'none'; img-src 'none'; script-src 'self'; script-src-elem 'self'; script-src-attr 'none'; style-src 'self'; style-src-elem 'self'; style-src-attr 'none'; base-uri 'none'; form-action 'none'; frame-ancestors about:; block-all-mixed-content; upgrade-insecure-requests",
  "browser_specific_settings": {
    "gecko": {
      "id": "reopen-in-private@apps.jeurissen.co"
    }
  },
  "externally_connectable": {
    "accepts_tls_channel_id": false
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "optional_permissions": [
    "history",
    "tabs"
  ],
  "icon_variants": [
    {
      "16": "/images/to-private-16.svg",
      "19": "/images/to-private-19.svg",
      "32": "/images/to-private-16.svg",
      "38": "/images/to-private-19.svg",
      "48": "/images/to-private-16.svg"
    },
    {
      "16": "/images/to-private-16.png",
      "19": "/images/to-private-19.png",
      "32": "/images/to-private-32.png",
      "38": "/images/to-private-38.png",
      "48": "/images/to-private-48.png",
      "96": "/images/to-private-96.png",
      "128": "/images/to-private-128.png"
    }
  ],
  "background": {
    "page": "/views/background.html",
    "persistent": false
  },
  "options_ui": {
    "page": "/views/options.html"
  },
  "commands": {
    "_execute_browser_action": {
      "description": "__MSG_cj_i18n_07536__"
    }
  },
  "icons": {
    "16": "/images/to-private-16.png",
    "19": "/images/to-private-19.png",
    "32": "/images/to-private-32.png",
    "38": "/images/to-private-38.png",
    "48": "/images/to-private-48.png",
    "96": "/images/to-private-96.png",
    "128": "/images/to-private-128.png"
  },
  "options_page": "/views/options.html",
  "browser_action": {
    "browser_style": false,
    "default_area": "navbar",
    "pin_by_default": true,
    "default_title": "__MSG_cj_i18n_07536__",
    "icon_variants": [
      {
        "16": "/images/to-private-16.svg",
        "19": "/images/to-private-19.svg",
        "32": "/images/to-private-16.svg",
        "38": "/images/to-private-19.svg",
        "48": "/images/to-private-16.svg"
      },
      {
        "16": "/images/to-private-16.png",
        "19": "/images/to-private-19.png",
        "32": "/images/to-private-32.png",
        "38": "/images/to-private-38.png",
        "48": "/images/to-private-48.png",
        "96": "/images/to-private-96.png"
      }
    ],
    "default_icon": {
      "16": "/images/to-private-16.png",
      "19": "/images/to-private-19.png",
      "32": "/images/to-private-32.png",
      "38": "/images/to-private-38.png",
      "48": "/images/to-private-48.png",
      "96": "/images/to-private-96.png"
    },
    "theme_icons": [
      {
        "dark": "/images/to-private-16.svg",
        "light": "/images/to-private-16.svg",
        "size": 16
      },
      {
        "dark": "/images/to-private-19.svg",
        "light": "/images/to-private-19.svg",
        "size": 19
      },
      {
        "dark": "/images/to-private-16.svg",
        "light": "/images/to-private-16.svg",
        "size": 32
      },
      {
        "dark": "/images/to-private-19.svg",
        "light": "/images/to-private-19.svg",
        "size": 38
      },
      {
        "dark": "/images/to-private-16.svg",
        "light": "/images/to-private-16.svg",
        "size": 48
      },
      {
        "dark": "/images/to-private-16.svg",
        "light": "/images/to-private-16.svg",
        "size": 96
      }
    ]
  },
  "applications": {
    "gecko": {
      "id": "reopen-in-private@apps.jeurissen.co"
    }
  }
}