Examine source code of Start at the beginning

{
  "manifest_version": 3,
  "name": "Start at the beginning",
  "description": "A Mozilla Firefox add-on that lets you start YouTube videos at the beginning.",
  "version": "1.1.5",
  "permissions": [
    "storage"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "graphics/16.png",
      "32": "graphics/32.png",
      "48": "graphics/48.png",
      "128": "graphics/128.png",
      "256": "graphics/256.png"
    }
  },
  "icons": {
    "16": "graphics/16.png",
    "32": "graphics/32.png",
    "48": "graphics/48.png",
    "128": "graphics/128.png",
    "256": "graphics/256.png"
  },
  "background": {
    "scripts": [
      "background/icon.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "content-scripts/satb.js"
      ],
      "matches": [
        "https://*.youtube.com/*"
      ],
      "exclude_matches": [
        "https://studio.youtube.com/*",
        "https://*.youtube.com/embed*"
      ]
    }
  ],
  "homepage_url": "https://www.nwawsoft.com/start-at-the-beginning-firefox/",
  "author": "Nico Wawrzyniak",
  "browser_specific_settings": {
    "gecko": {
      "id": "start-at-the-beginning@nwawsoft.com",
      "strict_min_version": "109.0"
    }
  }
}