Examine source code of Keepo

{
  "description": "This is add ons for embed article from Keepo",
  "manifest_version": 2,
  "name": "Keepo",
  "version": "1.10resigned1",
  "homepage_url": "https://keepo.me",
  "icons": {
    "16": "icons/logo-16.png",
    "32": "icons/logo-32.png",
    "48": "icons/logo-48.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icons/logo-48.png",
    "default_title": "Keepo",
    "default_popup": "html/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8d0b8c7d-6cb8-456c-ad60-9643370e87bf}"
    }
  }
}