Examine source code of Block Instagram Explore

{
  "manifest_version": 2,
  "name": "Block Instagram Explore",
  "version": "1.0",
  "description": "Addon to block Instagram Explore page",
  "applications": {
    "gecko": {
      "id": "block_instagram_explore@jonas-hellmann.de"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "js": [
        "block_instagram_explore.js"
      ]
    }
  ]
}