Examine source code of NewsFeed

{
  "manifest_version": 2,
  "name": "NewsFeed",
  "version": "1.1",
  "description": "Read latest news from public RSS feeds with save-for-later feature.",
  "permissions": [
    "storage",
    "https://api.allorigins.win/*"
  ],
  "browser_action": {
    "default_popup": "newsfeed-popup.html",
    "default_icon": "newsfeed-icon.png"
  },
  "icons": {
    "16": "newsfeed-icon.png",
    "48": "newsfeed-icon.png",
    "128": "newsfeed-icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0dcfa944-4d1c-4ed1-b517-57986f90b080}"
    }
  }
}