Examine source code of Scroll to changes

{
  "manifest_version": 2,
  "name": "Scroll to changes",
  "short_name": "ScrollToChange",
  "version": "1.1",
  "description": "Scroll page to the last change, such as comment appears",
  "developer": {
    "name": "dmitrevo",
    "url": "https://cont.ws/@dmitrevo"
  },
  "homepage_url": "https://github.com/dmiandr/",
  "icons": {
    "48": "updown.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "page_action": {
    "default_title": "Autoscroll to changes",
    "show_matches": [
      "<all_urls>"
    ],
    "default_icon": {
      "48": "updown_off.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{844884cc-0b3c-4ba2-8e68-aa81f9a1b784}"
    }
  }
}