Examine source code of Fire RSS Reader

{
  "manifest_version": 2,
  "name": "Fire RSS Reader",
  "version": "0.12.2resigned1",
  "short_name": "rrss",
  "description": "Reader of RSS feeds",
  "applications": {
    "gecko": {
      "id": "@firerss",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "128": "chrome/icon128.png"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "downloads",
    "tabs",
    "http://*/",
    "https://*/"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "content_scripts": [
    {
      "js": [
        "chrome/sniff_common.js",
        "chrome/doc_start.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start"
    },
    {
      "js": [
        "chrome/sniff_common.js",
        "chrome/feed_finder.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Fire RSS Reader",
    "default_icon": "chrome/icon_rss.png"
  },
  "background": {
    "scripts": [
      "chrome/background.js"
    ]
  }
}