Examine source code of Roku Forwarder

{
  "background": {
    "scripts": [
      "extractors.js",
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": false,
    "default_popup": "browser_action.html"
  },
  "icons": {
    "48": "RokuLogo5.svg",
    "96": "RokuLogo5.svg"
  },
  "page_action": {
    "default_icon": "RokuLogo5.svg",
    "default_title": "Play this on your Roku",
    "show_matches": [
      "*://*.netflix.com/*",
      "*://*.amazon.com/Amazon-Video/*",
      "*://*.amazon.com/gp/video/detail/*",
      "*://*.pandora.com/*",
      "*://*.youtube.com/*",
      "*://*.funimation.com/*",
      "*://*.hulu.com/*",
      "*://*.crunchyroll.com/*",
      "*://*.plex.tv/*",
      "*://*.vudu.com/*",
      "*://*.hbomax.com/*",
      "*://*.vrv.co/*",
      "*://*.disneyplus.com/*",
      "*://*.twitch.tv/*",
      "*://*.peacocktv.com/*"
    ]
  },
  "manifest_version": 2,
  "name": "Roku Forwarder",
  "permissions": [
    "*://*.amazon.com/*",
    "*://*.aiv-cdn.net/*",
    "storage",
    "activeTab",
    "tabs",
    "webRequest",
    "bookmarks",
    "menus"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "options_ui": {
    "browser_style": false,
    "page": "options.html"
  },
  "version": "0.1.2"
}