Examine source code of Betterflix

{
  "manifest_version": 2,
  "name": "Betterflix",
  "version": "1.0.1",
  "description": "Improves Netflix UI",
  "icons": {
    "512": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": {
      "512": "icons/icon.png"
    },
    "default_title": "Betterflix",
    "default_popup": "config.html"
  },
  "options_ui": {
    "page": "popup/config.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.netflix.com/browse",
        "https://www.netflix.com/browse/*",
        "https://www.netflix.com/browse?*",
        "https://www.netflix.com/watch/*"
      ],
      "js": [
        "betterflix.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://*.netflix.com/*",
    "*://*.nflxvideo.net/*"
  ],
  "applications": {
    "gecko": {
      "id": "betterflix@jellywx.com"
    }
  }
}