Examine source code of URSTYLE Clipper Tool

{
  "name": "URSTYLE Clipper Tool",
  "version": "1.4",
  "description": "Save items you love to URSTYLE.com",
  "permissions": [
    "activeTab",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "notifications",
    "alarms",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "lib/urstyle.js"
  ],
  "browser_action": {
    "default_icon": {
      "19": "images/ur_19.png",
      "38": "images/ur_38.png"
    },
    "default_title": "+TAG"
  },
  "icons": {
    "16": "images/ur_16.png",
    "32": "images/ur_32.png",
    "48": "images/ur_48.png",
    "128": "images/ur_128.png"
  },
  "manifest_version": 2
}