Privacy policy
Last updated: May 2026
Tab Black Hole is a Chrome extension that helps you keep tab overload under control. This page explains what the extension does and does not do with your data.
The short version
- Your settings, statistics, and tab groups stay on your device.
- The extension never reads page content, never reads URL contents beyond what is needed to decide whether a tab is countable, and never sends any of this information anywhere.
- Anonymous analytics is optional and off by default. After install, a welcome page asks once (if you installed before version 1.10, the side panel asks once instead); you can change the answer anytime in Options.
- When you uninstall the extension, Chrome may open a one-question Google Form. Submitting is optional.
What is stored on your device
The extension uses Chrome's local and sync storage on your machine for:
- Your tab limit and counting preferences.
- Identifiers of the tab groups it manages, so it can keep using the same group instead of creating new ones.
- Per-device statistics: how many overflow tabs were caught, peak tab count, days active, current streak under the limit.
- State of the optional review prompt (whether it's been shown, dismissed, or disabled).
- If analytics is on: an anonymous random identifier and a queue of unsent events.
None of this leaves your device unless analytics is on.
Optional anonymous analytics
Off by default. Turn it on with "Share anonymous counts" on the welcome page or in the side panel, or in Options under "Help improve Tab Black Hole with anonymous usage data." When on, the extension sends event counts and timings to Amplitude, a data processor based in the United States. The list of events:
extension_installed,extension_updated— version and locale.daily_active— once a day, numbers only: open windows and counted tabs, how many windows are over the limit, your limit.welcome_completed— the limit you picked on the welcome page.overage_detected,victory— how many tabs were over, how long the overflow lasted.attention_page_shown,overflow_tabs_closed,stale_tabs_closed— how many tabs you closed from the guide or the side panel.review_prompt_shown,review_prompt_sentiment,review_prompt_outcome— whether you opened the review prompt and which button you chose.side_panel_opened,side_panel_keyboard_open— how you opened the side panel.option_changed— which setting you changed and its new value.memory_estimate_shown,memory_estimate_toggled— whether the memory estimate is on.telemetry_opted_in— when and where you turned analytics on (welcome page, side panel, or Options).
Each event carries the extension version, browser locale, OS family, and an anonymous device identifier. No URLs, tab titles, page content, browsing history, IP addresses, names, or email addresses are ever sent.
Uninstall feedback
When the extension is uninstalled, Chrome may open a short feedback page hosted on Google Forms. The form asks one multiple-choice question about why you uninstalled and lets you add a free-text comment. The extension version and your browser locale are pre-filled in hidden fields. Submitting is optional — close the page and nothing is sent.
Third parties
Tab Black Hole shares data only with two processors, only when you opt in:
- Amplitude — receives the anonymous analytics events when you turn analytics on. Amplitude's privacy policy.
- Google Forms — receives the uninstall feedback if you submit the form. Google's privacy policy.
No data is shared with advertisers or sold to anyone.
Children
The extension is not directed to children under 13 and does not knowingly collect data from them.
Changes
If this policy changes, the new version replaces the one on this page and the "Last updated" date above changes.
Contact
Questions, requests, or anything you'd like the developer to know? Use the feedback option inside the extension (under Options) or open an issue on the project's public repository if one is linked from the listing.