Examine source code of LoopbackSide

{
  "manifest_version": 2,
  "name": "LoopbackSide",
  "version": "1.1resigned1",
  "author": "Anindyasundar Bera",
  "description": "this extension shows the invisible sidebars of loopback.io documentation",
  "icons": {
    "48": "icons/border-48.png"
  },
  "applications": {
    "gecko": {
      "id": "loopbackside@mrbera.in"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.loopback.io/*"
      ],
      "js": [
        "sidebars.js"
      ]
    }
  ]
}