ImgURL-Chrome-Extension/manifest.json

 {
    "name": "ImgURL",
    "description" : "Base Level Extension",
    "version": "1.0",
    "manifest_version": 2,
    "permissions": ["storage", "declarativeContent"],
    "browser_action": {
      "default_popup": "index.html",
      "default_icon": "images/16.png"
    },
    "commands": {
      "_execute_browser_action": {
        "suggested_key": {
          "default": "Ctrl+Shift+U",
          "mac": "MacCtrl+Shift+U"
        },
        "description": "Opens index.html"
      }
    },
    "icons": {
      "16": "images/16.png",
      "32": "images/32.png",
      "48": "images/48.png",
      "128": "images/128.png"
    }
 }