Examine source code of Page Cleaner

{
  "name": "Page Cleaner",
  "version": "4.0",
  "description": "Makes pages look cleaner, by blocking ads and removing unnecessary elements.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/",
    "storage",
    "tabs",
    "<all_urls>",
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "blacklist.js",
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "icons": {
    "16": "Icon16.png",
    "32": "Icon32.png",
    "64": "Icon64.png"
  }
}