Examine source code of TabMan

{
  "manifest_version": 2,
  "name": "TabMan",
  "version": "2.0.1",
  "description": "Save your most important tabs in kanban style and access it easily in newtab.",
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "bookmarks",
    "history"
  ],
  "browser_action": {
    "default_title": "TabMan",
    "default_icon": {
      "16": "icons/icon-16.svg",
      "32": "icons/icon-32.svg",
      "48": "icons/icon-48.svg",
      "128": "icons/icon-128.svg"
    }
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "icons": {
    "16": "icons/icon-16.svg",
    "32": "icons/icon-32.svg",
    "48": "icons/icon-48.svg",
    "128": "icons/icon-128.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f68070f-6a02-496d-b732-5e8fdbfcebb4}"
    }
  }
}