Timer - The Best Web Time Tracker

To be the BEST web timer.
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manifest.json
{
  "name": "__MSG_meta_marketName__",
  "description": "__MSG_meta_description__",
  "version": "1.8.2",
  "author": "zhy",
  "default_locale": "en",
  "homepage_url": "https://github.com/sheepzh/timer",
  "manifest_version": 2,
  "icons": {
    "16": "static/images/icon.png",
    "48": "static/images/icon.png",
    "128": "static/images/icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "webNavigation",
    "contextMenus",
    "chrome://favicon/**",
    "idle",
    "alarms"
  ],
  "optional_permissions": [
    "clipboardRead"
  ],
  "browser_action": {
    "default_popup": "static/popup.html",
    "default_icon": "static/images/icon.png"
  },
  "options_page": "static/app.html#/additional/option",
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8cf72f7-09b7-4cd4-9aaa-7a023bf09916}"
    }
  }
}