Examine source code of Local Image File Viewer

{
  "manifest_version": 2,
  "description": "Next and previous buttons for viewing images in local file URLs to browse folders",
  "name": "Local Image File Viewer",
  "content_scripts": [
    {
      "js": [
        "Cr.js",
        "common.js",
        "localfiles.user.js"
      ],
      "run_at": "document_start",
      "matches": [
        "file:///*"
      ]
    }
  ],
  "options_page": "about.html",
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ],
    "persistent": false
  },
  "page_action": {
    "default_icon": {
      "19": "img/dim/icon19.png",
      "38": "img/dim/icon38.png"
    },
    "default_title": "Local Image Viewer",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "64": "img/icon64.png",
    "128": "img/icon128.png"
  },
  "web_accessible_resources": [
    "localfiles_print.css",
    "img/arrow_left.png",
    "img/arrow_right.png",
    "img/arrow_up.png",
    "img/zoom_in.png",
    "img/zoom_out.png",
    "img/play.png",
    "img/pause.png",
    "img/ffwd.png",
    "img/r_right.png",
    "img/r_left.png",
    "img/save.png",
    "img/edit.png",
    "img/fillscreen.png",
    "img/gear.png",
    "img/thumbs.png",
    "about.html"
  ],
  "permissions": [
    "tabs",
    "webNavigation",
    "storage",
    "<all_urls>"
  ],
  "version": "0.0.0.43",
  "browser_specific_settings": {
    "gecko": {
      "id": "{13c9fd7a-58f4-4a28-9ff9-75e54ad1d540}"
    }
  }
}