Examine source code of Easy to RSS

{
  "manifest_version": 2,
  "name": "Easy to RSS",
  "description": "Retreive RSS feeds URLs from WebSite, RSSHub supported",
  "version": "0.2.1resigned1",
  "author": "@idealclover",
  "homepage_url": "https://github.com/idealclover/Easy-to-RSS",
  "permissions": [
    "http://*/*",
    "https://*/*",
    "clipboardWrite",
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "img/icon_default.png",
    "default_popup": "popup.html",
    "default_title": "Click to view RSS feeds for this page"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "128": "img/icon_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{45909d54-3dd5-4298-8bb0-8a8d27a333ff}"
    }
  }
}