Examine source code of Collapse Tabgroups

{
  "author": "igorlogius",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{413793a0-017b-4259-a6d6-35a4025f1c61}"
    }
  },
  "homepage_url": "https://github.com/igorlogius/webextensions/tree/main/sources/collapse-tabgroups",
  "browser_action": {
    "default_area": "navbar"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "_execute_browser_action": {}
  },
  "icons": {
    "1024": "icon.png"
  },
  "description": "Control the collapse state of tabgroups",
  "manifest_version": 2,
  "name": "Collapse Tabgroups",
  "permissions": [
    "menus",
    "tabs",
    "tabGroups"
  ],
  "version": "1.0.5"
}