Examine source code of Instalike

{
  "applications": {
    "gecko": {
      "id": "Instalike@madde22.com",
      "strict_min_version": "42.0"
    }
  },
  "description": "Auto liker for Instagram feed",
  "manifest_version": 2,
  "name": "Instalike",
  "version": "1.2.2",
  "homepage_url": "http://www.madde22.com",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icons/icon-32-p.png",
      "48": "icons/icon-48-p.png",
      "64": "icons/icon-64-p.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "js": [
        "Instalike.js"
      ]
    }
  ]
}