Examine source code of Tidebringer

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "tidebringer@steffo.eu"
    }
  },
  "name": "Tidebringer",
  "version": "2022.7.22.3",
  "version_name": "2022-07-22",
  "developer": {
    "name": "Stefano Pigozzi",
    "url": "https://github.com/Steffo99/tidebringer-firefox"
  },
  "description": "Add a 'Add all subscribed elements to collection' button to Steam Workshop pages.",
  "background": {
    "scripts": []
  },
  "content_scripts": [
    {
      "matches": [
        "https://steamcommunity.com/sharedfiles/managecollection/*"
      ],
      "js": [
        "add_items_to_collection.js"
      ],
      "css": [
        "add_items_to_collection.css"
      ]
    }
  ],
  "icons": {
    "128": "tidebringer.png"
  }
}