Examine source code of cobalt downloader

{
  "name": "cobalt downloader",
  "description": "allows easy downloads of media via cobalt.",
  "version": "1.0.7",
  "manifest_version": 3,
  "homepage_url": "https://github.com/dimdenGD/cobalt-extension",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "declarativeNetRequest",
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "128": "/images/co.png"
  },
  "action": {
    "default_icon": {
      "128": "/images/co.png"
    },
    "default_title": "download media from this page"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset",
        "enabled": true,
        "path": "ruleset.json"
      }
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cobalt@dimden.dev",
      "strict_min_version": "101.0"
    }
  },
  "optional_permissions": [
    "webRequest"
  ]
}