Examine source code of Uppity

{
  "manifest_version": 2,
  "name": "Uppity",
  "version": "2.3.1",
  "description": "Navigate up one level (directory).",
  "homepage_url": "https://github.com/arantius/uppity",
  "icons": {
    "32": "skin/em-icon.png"
  },
  "default_locale": "en_US",
  "applications": {
    "gecko": {
      "id": "{16cbd87c-eb99-4f5c-9825-83cf13ab7ff8}",
      "strict_min_version": "79.0"
    }
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": "skin/tb-icon-large.png",
    "default_title": "Uppity"
  },
  "background": {
    "scripts": [
      "shared.js",
      "bg.js"
    ]
  },
  "commands": {
    "go-up": {
      "description": "Go up to the next shorter URL.",
      "suggested_key": {
        "default": "Alt+Up"
      }
    },
    "menu": {
      "description": "Open a menu of all possible shorter URLs.",
      "suggested_key": {
        "default": "Alt+Down"
      }
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "webNavigation"
  ]
}