Examine source code of teddit-image-previews

{
  "manifest_version": 2,
  "name": "teddit-image-previews",
  "version": "1.3",
  "description": "Improved image previews for teddit.net",
  "content_scripts": [
    {
      "matches": [
        "*://teddit.net/r/*/comments/*"
      ],
      "js": [
        "build/teddit_image_previews.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "build/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "teddit-image-previews@twenty.com"
    }
  }
}