Examine source code of GIFCopier

{
  "manifest_version": 2,
  "name": "GIFCopier",
  "version": "1.0",
  "description": "Extension for GIF and short clip copying.",
  "homepage_url": "https://github.com/syanth/gifcopier",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gifcopier@syanth"
    }
  },
  "permissions": [
    "contextMenus",
    "nativeMessaging"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}