Examine source code of Resurrect Pages

{
  "manifest_version": 2,
  "name": "Resurrect Pages",
  "description": "Resurrect dead pages, by finding their ghosts.",
  "version": "9",
  "homepage_url": "https://github.com/arantius/resurrect-pages",
  "applications": {
    "gecko": {
      "id": "{0c8fbd76-bdeb-4c52-9b24-d587ce7b9dc3}",
      "strict_min_version": "79.0"
    }
  },
  "background": {
    "scripts": [
      "common.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/page-32.png",
    "default_title": "Resurrect Pages",
    "default_popup": "popup.htm"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      }
    }
  },
  "icons": {
    "16": "icons/page-16.png",
    "32": "icons/page-32.png"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "tabs",
    "activeTab"
  ]
}