Examine source code of Images Quicky

{
  "manifest_version": 2,
  "name": "Images Quicky",
  "version": "2.3resigned1",
  "description": "Quick browse URL images gallery! Next/prev, zoom and download! ;)",
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "downloads",
    "contextMenus"
  ],
  "commands": {
    "next-image": {
      "suggested_key": {
        "default": "Alt+Period"
      }
    },
    "prev-image": {
      "suggested_key": {
        "default": "Alt+Comma"
      }
    }
  },
  "browser_action": {
    "default_icon": "icon@2x.png",
    "browser_style": true,
    "default_title": "Images Quicky",
    "default_popup": "quicky.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6b868af6-5c75-4428-a1ae-8c193e5eb349}"
    }
  }
}