Chrome Permission Audit

Chrome 'alarms' permission & background service workers in Manifest V3.

What does the 'alarms' permission do in Chrome extensions? Understand the difference between event-driven user-triggered extensions and scheduled background polling.

Best fit

Best for users comparing strictly user-triggered AI reading tools with background-polling browser agents.

Technical Manifest Audit

Permission specification & risk profile.

Review how Chrome enforces alarms in Manifest V3 and how to tell legitimate user-triggered extensions apart from intrusive tools.

Risk level: Loweralarms
Chrome install-time warning
None (displays no install-time warning in Chrome)
Manifest V3 declaration
{
  "manifest_version": 3,
  "permissions": ["alarms"],
  "background": {
    "service_worker": "background.js"
  }
}
Legitimate uses vs. red flags
What to verify before granting this permission to an AI browser tool.

Legitimate AI reading uses

  • Waking up a sleeping Manifest V3 service worker on a schedule for legitimate reminder or page-monitoring tools
  • Periodically clearing expired local cache entries

Red flags to watch for

  • Combining `alarms` with `<all_urls>` and `tabs` to periodically scrape open tabs or ping tracking endpoints every 5 minutes while you aren't using the extension
How Vezz me handles this: Vezz me does NOT request the `alarms` permission. Its background service worker sleeps with 0% CPU and 0 RAM usage until you actively press your shortcut.
Step-by-step workflow

How to run this workflow in place.

1

Check whether the service worker sleeps when idle

In Manifest V3, a well-behaved extension service worker terminates automatically after 30 seconds of inactivity, freeing all memory.

2

Avoid periodic background polling unless needed

Unless you specifically installed a price-tracker or uptime monitor, an AI reading extension should never run periodic `chrome.alarms` jobs.

Key details

Why this approach works better than switching tabs.

Why Vezz me uses zero RAM when you aren't asking a question
Browser sluggishness usually comes from extensions that keep background timers and heavy DOM observers running 24/7.
  • No `alarms` permission—Vezz me never wakes up on a timer in the background
  • Service worker wakes up only when you press `Ctrl+Shift+X` (or open the settings popup) and goes right back to sleep afterward
Frequently asked questions

Common questions about chrome permission audit.

How can I check if an extension is running in the background right now?

Press Shift+Escape in Chrome (or open Chrome's Window -> Task Manager) to see live CPU and memory usage for every active extension.

Related workflows & guides

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Available for Chrome and Firefox

Ready to try this workflow on your own reading?

Install Vezz me free, highlight text on any webpage, and press your customizable shortcut (default: Ctrl+Shift+X or Cmd+Shift+X on Mac) to get an answer right beside the source.

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