Hide images with NOPE. 2.0

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Hide images with NOPE. 2.0",
  "description": "Hide page images",
  "version": "2.3.1",
  "icons": {
    "16": "img/icon.png",
    "32": "img/icon.png",
    "64": "img/icon.png",
    "128": "img/icon.png"
  },
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_popup": "html/popup.html"
  },
  "background": {
    "persistent": false,
    "page": "html/background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/jquery.js",
        "js/jquery-ui.js",
        "js/contentscript.js"
      ],
      "css": [
        "css/style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "img/placeholder.png",
    "img/loading.gif",
    "js/jquery.js",
    "js/jquery-ui.js",
    "js/bootstrap.min.js",
    "css/style",
    "css/jquery-ui.css"
  ],
  "permissions": [
    "contextMenus",
    "activeTab",
    "<all_urls>"
  ]
}