Examine source code of BitSec Tab/URL Manager

{
  "applications": {
    "gecko": {
      "id": "urlmanager@bitsec",
      "strict_min_version": "42.0"
    }
  },
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "name": "BitSec URL Manager",
  "description": "This extension allows you to open all the URLs that you want with the click of 2 buttons",
  "version": "1.1.3resigned1",
  "author": "BitSec",
  "options_ui": {
    "browser_style": true,
    "page": "html/options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "32": "media/icon_32.png",
      "48": "media/icon_48.png",
      "96": "media/icon_96.png",
      "128": "media/icon_128.png"
    },
    "default_title": "BitSec URL Manager",
    "default_popup": "html/popup.html"
  },
  "icons": {
    "32": "media/icon_32.png",
    "48": "media/icon_48.png",
    "96": "media/icon_96.png",
    "128": "media/icon_128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab"
  ]
}