Examine source code of freestream

{
  "name": "freestream",
  "version": "1.0",
  "description": "Allows HLS streaming",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*/*.m3u8*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "icons/icon_128_grey.png"
  },
  "content_security_policy": "script-src 'self' blob:; object-src 'self'",
  "manifest_version": 2
}