Examine source code of remove YT comment preview

{
  "manifest_version": 2,
  "name": "remove YT comment preview",
  "description": "Remove the annoying comment preview that gets you to click on the comments section",
  "version": "1.0",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "previewremover.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Remove Comment Preview"
  },
  "icons": {
    "48": "icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{875ea8ea-49f5-45f6-8a4f-154bec02ca4b}"
    }
  }
}