Examine source code of Color Code Tab Groups

{
  "manifest_version": 2,
  "name": "Color Code Tab Groups",
  "version": "1.0.2",
  "description": "Automatically color tab groups based on user-defined keywords.",
  "applications": {
    "gecko": {
      "id": "color_code_tab_groups@luascfl"
    }
  },
  "permissions": [
    "storage",
    "tabGroups",
    "tabs",
    "menus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Color Code Tab Groups",
    "default_popup": "popup/popup.html",
    "default_icon": "icons/icon-32.png"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  }
}