Examine source code of ColorTabs

{
  "manifest_version": 2,
  "name": "ColorTabs",
  "version": "1.4",
  "author": "Joe Jalbert",
  "homepage_url": "https://github.com/joseph-jalbert/colortabs",
  "description": "Set the color of the browser window based on the current domain so you'll never forget which environment you're in. Save/load your settings as a JSON file with 'export' and 'import' to keep settings across devices or share them.",
  "applications": {
    "gecko": {
      "id": "colortabs@joejalbert.com"
    }
  },
  "icons": {
    "32": "icons/thumb.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "theme",
    "downloads"
  ],
  "background": {
    "scripts": [
      "scripts/switcher.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/thumb.png",
    "default_title": "colors"
  },
  "sidebar_action": {
    "default_title": "ColorTabs",
    "default_panel": "popup.html",
    "default_icon": {
      "32": "icons/thumb.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}