Examine source code of Link Saver

{
  "manifest_version": 2,
  "name": "Link Saver",
  "description": "Save links for use later.",
  "version": "1.2resigned1",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/custom.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af53bf43-cfa2-4505-bc73-a719cbca479c}"
    }
  }
}