Examine source code of IG Follow

{
  "description": "Redirect IG homepage and Reels tab towards actual timeline ('following' instead of 'for you')",
  "manifest_version": 2,
  "name": "IG Follow",
  "version": "1.0",
  "homepage_url": "http://grmblx.com",
  "icons": {
    "48": "icons/icon48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "redirect.js"
      ]
    }
  ],
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6be6168c-5ca0-4b65-ab13-f8a7f3ed90f4}"
    }
  }
}