Examine source code of RSS Sidebar

{
  "manifest_version": 3,
  "name": "RSS Sidebar",
  "version": "2.1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{1529bff3-4309-49ae-ba61-8536bbbf463c}"
    }
  },
  "description": "Simple Feed Reader for Firefox",
  "homepage_url": "https://github.com/david-youster/really-simple-rss",
  "icons": {
    "48": "images/rss.svg"
  },
  "permissions": [
    "storage",
    "bookmarks",
    "menus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "js/service/webex.js",
      "js/service/settings.js",
      "js/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "action": {
    "default_icon": "images/rss.svg",
    "default_title": "RSS Sidebar"
  },
  "sidebar_action": {
    "default_icon": "images/rss.svg",
    "default_title": "RSS",
    "default_panel": "html/index.html"
  },
  "options_ui": {
    "page": "html/settings.html"
  }
}