Examine source code of Page Element Blocker

{
  "manifest_version": 2,
  "name": "Cookie Popup Blocker",
  "description": "Lets you hide annoying popups",
  "version": "1.0",
  "icons": {
    "150": "icon_128.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://*/*"
      ],
      "js": [
        "jquery-3.1.1.js",
        "content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "tabs",
    "scripting",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56c7ba6a-b08f-4a20-8ae5-657fa82f770c}"
    }
  }
}