Examine source code of TimeDripper

{
  "manifest_version": 2,
  "name": "TimeDripper",
  "version": "1.2.0",
  "description": "Limits access time to specific websites. The access time gradually recovers at a consistent pace.",
  "icons": {
    "16": "icon/app/app_icon_16.png",
    "48": "icon/app/app_icon_48.png",
    "128": "icon/app/app_icon_128.png"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/util.js",
      "src/tab-manager.js",
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/page-overlay.js",
        "src/idle-detector.js",
        "src/content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_icon": "icon/light/inactive_100.png",
    "default_popup": "popup/popup.html",
    "default_title": "TimeDripper"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0aecd048-64a7-4a43-b8db-a42a9c49e13e}"
    }
  }
}