Examine source code of RSS feed helper

{
  "description": "Find RSS/Atom feeds, and get RSS-bridge URLs for the current page. Optional integration with tt-rss or miniflux to one-click subscribe to a feed.",
  "manifest_version": 2,
  "name": "RSS feed helper",
  "version": "1.3",
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content_scripts/cs.js",
        "content_scripts/rss_bridge.js",
        "content_scripts/scraper.js",
        "content_scripts/bridges/youtube.js",
        "content_scripts/bridges/twitter.js",
        "content_scripts/bridges/instagram.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "res/icon_default.png",
    "default_title": "See feeds for this page",
    "default_popup": "popup/main.html"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "storage",
    "tabs"
  ],
  "options_ui": {
    "page": "options/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "rss-bridge-helper@marks.kitchen",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "128": "res/icon_128.png"
  }
}