Examine source code of Fet Features

{
  "manifest_version": 3,
  "name": "Fet Features",
  "version": "1.0.1",
  "description": "Customize FetLife: filter notifications by type, adjust loved-picture thumbnails in the home feed, hide unwanted message requests. Unofficial; not affiliated with BitLove.",
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://fetlife.com/*"
      ],
      "js": [
        "src/core.js",
        "src/features/notifications.js",
        "src/features/home.js",
        "src/features/requests.js",
        "src/boot.js"
      ],
      "css": [
        "src/features/notifications.css",
        "src/features/home.css",
        "src/features/requests.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://fetlife.com/*"
      ],
      "js": [
        "src/page.js"
      ],
      "world": "MAIN",
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_popup": "src/popup.html",
    "default_title": "Fet Features",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "notification-filter-fetlife@kraehennest.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}