Examine source code of Quick Commands

{
  "manifest_version": 2,
  "name": "Quick Commands",
  "version": "1.5.2",
  "description": "An add-on that tries to mimic Vivaldi's Quick commands window. Open with Alt-Shift-R",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6ad355f-be44-4c03-9d49-a39f84ac702a}",
      "strict_min_version": "63.0"
    }
  },
  "content_scripts": [],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "icons/icon.svg",
      "38": "icons/icon.svg"
    },
    "default_title": "Quick Commands"
  },
  "permissions": [
    "bookmarks",
    "storage",
    "tabs",
    "history",
    "search"
  ],
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "commands": {
    "quick-commands": {
      "suggested_key": {
        "default": "Alt+Shift+R"
      },
      "description": "Open the quick-commands window"
    }
  }
}