Examine source code of Global Twitch Emotes

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "gte@melalawi.com",
      "strict_min_version": "50.0"
    }
  },
  "name": "Global Twitch Emotes",
  "short_name": "GTE",
  "description": "Twitch culture wherever you go! This extension replaces all Twitch.tv emote phrases with their actual emoticons.",
  "homepage_url": "https://ostrichtools.com/p/GlobalTwitchEmotes",
  "version": "1.5.0",
  "background": {
    "page": "popup.html"
  },
  "browser_action": {
    "default_title": "Global Twitch Emotes",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/images/logo16.png",
      "19": "assets/images/logo19.png",
      "20": "assets/images/logo20.png",
      "32": "assets/images/logo32.png",
      "38": "assets/images/logo38.png",
      "40": "assets/images/logo40.png"
    }
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "assets/images/logo16.png",
    "32": "assets/images/logo32.png",
    "48": "assets/images/logo48.png",
    "64": "assets/images/logo64.png",
    "128": "assets/images/logo128.png"
  },
  "permissions": [
    "activeTab",
    "http://*/",
    "https://*/",
    "storage",
    "tabs",
    "unlimitedStorage"
  ]
}