Examine source code of Time Tracking Extension

{
  "manifest_version": 2,
  "name": "Redmine Time Tracking Extension",
  "short_name": "CodeX Time Tracker",
  "description": "Track time to redmine from any task tracker and improve your productivity.",
  "background": {
    "scripts": [
      "serviceWorker.bundle.js"
    ]
  },
  "version": "1.15.0",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Redmine Time Tracking"
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "assets/images/logo-16.png",
    "48": "assets/images/logo-48.png",
    "128": "assets/images/logo-128.png"
  },
  "permissions": [
    "scripting",
    "storage",
    "tabs",
    "https://redmine.codex-soft.net/*",
    "https://*.atlassian.net/*",
    "https://github.com/*",
    "https://*.gitlab.com/*",
    "https://app.asana.com/*",
    "https://*.myjetbrains.com/*",
    "https://calendar.google.com/*",
    "https://gitlab.codex-soft.net/*",
    "https://jiradev.netfonds.de/*",
    "https://*.kanbanize.com/*",
    "https://hp-jira.external.hp.com/*",
    "notifications",
    "webRequest"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{e3ae99fe-c871-4168-a58c-e82e784177f1}"
    }
  }
}