Examine source code of heiseForumExpanderReloaded (hFER)

{
  "manifest_version": 2,
  "name": "heiseForumExpanderReloaded (hFER)",
  "version": "1.0.1",
  "author": "SWEETGOOD",
  "description": "Loads all posts from the heise.de web page. When opening the comments section from an article, the topics and their posts will be loaded and displayed on the same page. So you don't have to open and load each page separately. The script was initially written by Hearted Mother (http://heartedmother.bplaced.net/) and has been republished with acknowledgment under an open source license by SWEETGOOD",
  "homepage_url": "https://codeberg.org/SWEETGOOD/heiseForumExpanderReloaded",
  "icons": {
    "48": "icons/48.png",
    "192": "icons/192.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@heiseforumexpanderreloaded.sweetgood",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.heise.de/forum/*"
      ],
      "js": [
        "heiseForumExpanderReloaded.js"
      ]
    }
  ]
}