Examine source code of Save to Pocket (mini)

{
  "name": "Save to Pocket (mini)",
  "description": "Adds a toolbar button to save the current page to Pocket, without requiring the \"all data\" or \"all websites\" permissions.",
  "version": "2",
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Add to Pocket",
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab",
    "https://getpocket.com/"
  ],
  "web_accessible_resources": [
    "auth.html"
  ],
  "manifest_version": 2
}