Examine source code of rsstodolist

{
  "manifest_version": 3,
  "name": "rsstodolist",
  "version": "1.9.1",
  "description": "Send links to rsstodolist - https://rsstodolist.eu/",
  "homepage_url": "https://github.com/paulgreg/rsstodolist-addon",
  "icons": {
    "16": "imgs/rss16.png",
    "48": "imgs/rss48.png",
    "96": "imgs/rss96.png",
    "128": "imgs/rss.png"
  },
  "permissions": [
    "activeTab",
    "notifications",
    "storage",
    "contextMenus"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "page": "background-page.html"
  },
  "action": {
    "default_icon": "imgs/rss.png",
    "default_title": "rsstodolist",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "jid0-fsmvHJm6vogjlOsg61W1N560CwA@jetpack"
    }
  }
}