Examine source code of Pinboard Quantum

{
  "applications": {
    "gecko": {
      "id": "{31547e30-cfb0-43bd-9bf7-7f2d7a96fcd6}",
      "strict_min_version": "48.0a1"
    }
  },
  "manifest_version": 2,
  "name": "Pinboard",
  "version": "1.2.1resigned1",
  "description": "Pinboard.in extension to allow for easy bookmarking",
  "homepage_url": "https://pinboard.in/",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "command-all-bookmarks": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      },
      "description": "View all your Pinboard bookmarks"
    },
    "command-save-to-pinboard": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Save current URL to pinboard"
    }
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "19": "icons/pin-19.png",
      "38": "icons/pin-38.png"
    },
    "default_title": "Pinboard",
    "default_popup": "pinboard_menu.html"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "icons": {
    "48": "icons/pinboard-48.png",
    "96": "icons/pinboard-96.png"
  },
  "permissions": [
    "*://api.pinboard.in/*",
    "activeTab",
    "tabs",
    "menus",
    "notifications",
    "storage",
    "alarms"
  ]
}