Examine source code of New Hackbar

{
  "manifest_version": 2,
  "name": "New Hackbar",
  "description": "A sitebar that helps pentesters to perform manual web security testing inside their browser. This addon is writed in webextension and alternatives to the XUL version of origanal Hackbar.",
  "version": "1.0.5resigned1",
  "applications": {
    "gecko": {
      "strict_min_version": "57.0a1",
      "id": "{6196322d-f214-4991-ae33-b5f1d62bbf16}"
    }
  },
  "author": "mxcx",
  "developer": {
    "name": "mxcx",
    "url": "http://fosec.vn"
  },
  "homepage_url": "https://github.com/mxcxvn/newhackbar",
  "icons": {
    "48": "icons/fosecicon.png",
    "96": "icons/fosecicon.png"
  },
  "sidebar_action": {
    "default_icon": "icons/fosecicon.png",
    "default_title": "Hackbar",
    "default_panel": "newhackbar/newhackbar.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "F9"
      }
    },
    "do-command-execute": {
      "suggested_key": {
        "default": "Alt+X",
        "mac": "MacCtrl+X"
      }
    },
    "do-command-loadurl": {
      "suggested_key": {
        "default": "Alt+A",
        "mac": "MacCtrl+Z"
      }
    },
    "do-command-loadurl2": {
      "suggested_key": {
        "default": "Alt+Z"
      }
    },
    "do-command-spliturl": {
      "suggested_key": {
        "default": "Alt+S",
        "mac": "MacCtrl+S"
      }
    },
    "do-command-md5hash": {
      "suggested_key": {
        "default": "Alt+M",
        "mac": "MacCtrl+F"
      }
    }
  }
}