Examine source code of Mattermost Uno

{
  "manifest_version": 2,
  "name": "Mattermost Uno",
  "version": "1.9.2",
  "description": "Unofficial extension bringing some Slack-like features into Mattermost.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Mattermost Uno is disabled on this site.",
    "default_icon": "icons/icon-32x32-bw.png"
  },
  "permissions": [
    "https://*/*",
    "tabs"
  ],
  "icons": {
    "16": "icons/icon-16x16.png",
    "32": "icons/icon-32x32.png",
    "48": "icons/icon-48x48.png",
    "96": "icons/icon-96x96.png",
    "128": "icons/icon-128x128.png"
  },
  "default_locale": "en",
  "homepage_url": "https://github.com/ivangabriele/mattermost-uno",
  "author": "Ivan Gabriele"
}