Examine source code of Tab Tosser

{
  "manifest_version": 3,
  "name": "Tab Tosser",
  "author": "Jeremiah Lee",
  "developer": {
    "name": "Jeremiah Lee",
    "url": "https://www.jeremiahlee.com/"
  },
  "version": "3.3.1",
  "description": "Automatically close tabs that have been ignored for too long. Free yourself of digital clutter.",
  "homepage_url": "https://www.jeremiahlee.com/tab-tosser/",
  "icons": {
    "500": "icon.svg"
  },
  "permissions": [
    "idle",
    "storage",
    "tabs"
  ],
  "background": {
    "page": "./lib/background.html"
  },
  "options_ui": {
    "page": "./lib/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21b1ad73-381b-b441-8692-f6065d838c87}",
      "strict_min_version": "109.0"
    }
  }
}