Examine source code of Last Visit Search

{
  "author": "igorlogius",
  "background": {
    "scripts": [
      "TKVS.js",
      "background.js"
    ]
  },
  "browser_action": {},
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Last Visit Search",
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "tabs",
    "storage",
    "<all_urls>"
  ],
  "version": "1.18.9",
  "browser_specific_settings": {
    "gecko": {
      "id": "{97354244-d299-4c13-9ea4-89b0b8e8cf95}"
    }
  }
}