Examine source code of Favorite chat messages

{
  "manifest_version": 2,
  "name": "Favorite chat messages",
  "description": "Save and send messages with one click to Twitch chat. You can save your favorites messages and send them with only one click",
  "homepage_url": "https://github.com/moudev/favorite-chat-messages",
  "version": "0.0.2",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png"
  },
  "web_accessible_resources": [
    "build/favorite-chat-messages.js",
    "build/favorite-chat-messages.css"
  ],
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "run.js"
      ],
      "matches": [
        "*://*.twitch.tv/*"
      ],
      "exclude_matches": [
        "*://*.twitch.tv/*.html",
        "*://*.twitch.tv/*.html?*",
        "*://*.twitch.tv/*.htm",
        "*://*.twitch.tv/*.htm?*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{532975c4-b7cf-41d5-b839-3fc90bd734c4}"
    }
  }
}