CookieMop’s 15-second wait is a configurable grace period before cleanup—not Chrome’s service-worker timeout. It gives you a brief chance to recover from closing a tab by mistake. The Manifest V3 challenge is different: the extension must make that delayed cleanup survive the background service worker going idle.
When does CookieMop start the 15-second countdown?
CookieMop schedules cleanup after the last open tab for a site closes. Closing one tab does not trigger cleanup if another tab is still using that site. The extension uses the tabs permission to detect tab closes and determine which site each tab belongs to. CookieMop’s README describes the default delay as 15 seconds and a safety net for accidentally closed tabs; it is configurable.
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The sequence is therefore: the last tab for a site closes, the delay elapses, and CookieMop begins cleanup. The pause is a user-facing buffer, not a Chrome-imposed wait.
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Why is delayed cleanup difficult in Manifest V3?
The background worker can go dormant
Manifest V3 extensions use event-driven service workers rather than a background page that stays running continuously. Chrome documents a normal termination threshold of 30 seconds of inactivity. It also documents other limits: a single event or API request that runs for more than five minutes, and a fetch() response that takes more than 30 seconds, can lead to termination. These are worker-lifecycle rules, not CookieMop settings. Chrome’s service-worker lifecycle guide explains the conditions.
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A JavaScript timer is not durable scheduling
A setTimeout() callback exists in the worker’s running JavaScript context. If Chrome terminates that worker before the callback fires, the timer can be canceled with it. Chrome’s migration guidance recommends the Alarms API for delayed or periodic work because an alarm can wake the extension worker to handle the event. Chrome’s migration guide outlines this approach. CookieMop’s README names the alarms permission as the mechanism it uses to fire delayed cleanup reliably.
This is the hard part: not deciding to wait 15 seconds, but arranging the future work so it is not lost when the worker stops between the tab-close event and cleanup.
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How to distinguish the 15-second delay from Chrome’s 30-second rule
| Interval | What it describes | Source |
|---|---|---|
| 15 seconds by default | CookieMop’s configurable grace period after the last tab for a site closes. | CookieMop README |
| 30 seconds of inactivity | Chrome’s normal service-worker idle termination threshold. | Chrome lifecycle guidance |
| 30 seconds minimum alarm period in Chrome 120 | Chrome’s documented minimum period for alarms; this is not, by itself, proof that CookieMop cannot schedule a one-shot 15-second delay. | Chrome lifecycle guidance |
The two main intervals serve different purposes. CookieMop’s delay is about when the extension should clean up; Chrome’s inactivity threshold is about how long an idle worker may remain alive. Chrome’s alarm-period guidance changed in Chrome 120, but the available documentation does not establish how every supported Chrome version implements CookieMop’s exact one-shot delay. Do not treat the 30-second minimum period as evidence that every 15-second scheduled cleanup is impossible, or assume exact timing across versions without checking the release in use.
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Cookies-only cleanup is the default described in the project README. Users can optionally include localStorage or broader site data, including IndexedDB, CacheStorage, and service workers. Chrome’s browsingData API supports removal of these data types, including origin-scoped removal.
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There are two important scope limits to understand:
- Cookie scope can extend beyond one hostname. Chrome notes that removing cookies for an origin also removes cookies for its registrable domain. A cleanup request should not be assumed to affect only the exact hostname shown in a tab. Chrome’s browsingData documentation describes this behavior.
- Partitioned cookies are not covered. CookieMop’s README says it does not delete CHIPS (partitioned) cookies because the extension cookies API cannot enumerate them per top-level site.
CookieMop also documents that removal of data through Chrome’s browsing-data API can take tens of seconds depending on the user profile. That is the time the removal operation may take after it starts, not the 15-second grace period before cleanup begins. Chrome’s API documentation describes the possible removal duration.
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What happens to greylisted sites?
CookieMop’s README says greylisted cleanup runs on the next browser startup, and also when the extension itself is reloaded or updated. That means greylisted data is not necessarily removed at the moment the browser closes; its timing differs from the normal last-tab cleanup flow.
Quick Recap
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