Examine source code of Slack Channels Grouping

{
  "name": "Slack Channels Grouping",
  "description": "__MSG_appDescription__",
  "version": "1.0.40",
  "short_name": "slack-ch-grp",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "images/icon-16.png",
    "19": "images/icon-19.png",
    "32": "images/icon-32.png",
    "38": "images/icon-38.png",
    "48": "images/icon-48.png",
    "64": "images/icon-64.png",
    "128": "images/icon-128.png"
  },
  "minimum_chrome_version": "88.0",
  "content_scripts": [
    {
      "matches": [
        "http://app.slack.com/*",
        "https://app.slack.com/*"
      ],
      "css": [
        "styles/font-face-firefox.css",
        "styles/content.css"
      ],
      "js": [
        "scripts/content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "scripting",
    "http://app.slack.com/*",
    "https://app.slack.com/*"
  ],
  "web_accessible_resources": [
    "fonts/SlackChannelsGrounping-NotoSansJP-Medium.ttf"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{24d54390-97ea-4c57-b4be-7e32232ca609}",
      "strict_min_version": "102.0"
    }
  }
}