Examine source code of InstaFocus

{
  "name": "InstaFocus",
  "description": "Browse Instagram normally, but without the distraction of the home feed.",
  "version": "0.2",
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "128": "128.png"
  },
  "permissions": [
    "https://www.instagram.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "instafocus@ulysses.extensions",
      "strict_min_version": "109.0"
    }
  }
}