Examine source code of ShareKit.io Quick Access

{
  "name": "ShareKit.io Quick Access",
  "short_name": "ShareKit.io",
  "version": "1.0.1resigned1",
  "manifest_version": 2,
  "description": "This extension allows you to quickly create a custom link preview for the currently active tab using ShareKit.io",
  "homepage_url": "https://www.sharekit.io",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "src/bg/background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon19.png",
    "default_title": "Customize link preview"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{739799ca-1374-4b33-a1bf-efa4f874166d}"
    }
  }
}