Examine source code of Tasks IG

{
  "manifest_version": 2,
  "name": "Tasks IG",
  "version": "1.1.4",
  "author": "me@boku.ru",
  "description": "Sidebar task list manager resembling Google Tasks IG with a browser storage backend",
  "homepage_url": "https://github.com/himselfv/tasks-ig",
  "permissions": [
    "storage",
    "clipboardWrite"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "res/check2.png",
    "32": "res/check2_32.png",
    "64": "res/check2_64.png",
    "128": "res/check2_128_96.png"
  },
  "sidebar_action": {
    "default_icon": "res/check2.png",
    "default_title": "Tasks",
    "default_panel": "index.html",
    "browser_style": false
  },
  "browser_action": {
    "default_title": "Open Tasks IG",
    "default_icon": "res/check2.png",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "{4e494c38-202d-45f8-a450-90d8679dc278}"
    }
  }
}