freshbooks-resizer/manifest.json

{
  "manifest_version": 2,

  "name": "Timer Resizer for FreshBooks",
  "description": "This extension lets you easily minimize the FreshBooks Timesheet / Time Tracking timer window to give you more screen space while you work. (Not affiliated with or endorsed by FreshBooks in any way.)",
  "version": "1.1",

  "icons": { "48": "icon48.png",
          "128": "icon128.png" },

  "content_scripts": [
    {
      "matches": ["https://*.freshbooks.com/internal*"],
      "js": ["freshbooks-resizer.js","injected.js"]
    }
  ],
  "web_accessible_resources": ["injected.js"]
}