Important: Do not uninstall and reinstall OneTab unless you are happy to wipe all of your OneTab data.   This is because your browser will delete your OneTab data during the uninstall. If you are using our encrypted sync/backup feature (coming soon), then it is OK to uninstall OneTab as long as you are sure you know your OneTab encryption password.

In most cases, the problem can be solved by fully quitting the browser and then opening it again.   Please note that it is not enough to simply close all browser windows. You will need to use your browser's "Quit" menu option to ensure that it fully unloads. You should also ensure you have updated your browser to the latest version, since OneTab uses the latest browser features.

If you are using Chrome's "profiles" feature, each profile is independent. This means that if you had installed OneTab in one profile and then switch to a different profile, the OneTab icon won't appear.

Data lost/corrupted:   We're very sorry if this has happened to you. We have been working on the encrypted backup/sync feature so that this can't happen to you in the future.

OneTab data is stored in your browser's internal database. If you have suddenly lost all OneTab data, something must have deleted or corrupted that internal database. No bug in OneTab could cause it to suddenly delete its entire database.

• 'Privacy cleaner' and 'System cleaner' software:
  Software marketed to 'delete unnecessary files' or 'protect your privacy' can corrupt or delete your browser's internal databases, which would cause OneTab data to be lost. We have had several reports of this happening with software such as 'BleachBit' and 'Advanced SystemCare'. If you want to delete your browsing history, you should ask your browser to do this instead of installing third-party software.
• Firefox 'Refresh': Firefox will occasionally ask if you want to "Refresh Firefox to its default settings". If you accidentally click yes, this will delete all OneTab data.
• Low disk space: If you run out of disk space, your browser's databases can become corrupted or deleted entirely when your browser attempts to recover from not being able to write data to disk.
• Computer crashes or failing hardware: On rare occasions, your computer may crash while your browser is trying to write to disk, causing data corruption. Corruption can also happen if you have a faulty hard drive or memory chip.

To protect yourself from data loss, either regularly export your data, or use our cloud backup and sync feature (coming soon). If you don't use our backup/sync feature, then the only way to recover the deleted data is if you have been running backup software on your computer that can restore your browser's profile folder. Your browser's profile folder can be located by going to the URL chrome://version (or about:support on Firefox) and looking for your "profile path". If you have a backup of this profile folder that you can restore, you can recover the deleted or corrupted data.

If you are a long-time OneTab user and see a 'migration' dialog: OneTab v2 (released to all users around March 2026) uses a different browser database than OneTab v1. If the v2 storage becomes corrupted and is deleted, OneTab will automatically detect this and offer you the opportunity to at least recover the old OneTab v1 storage.

Outdated versions of Chrome and Chrome-based browsers:   OneTab uses some of the newest browser features, which can make out-of-date browser versions incompatible. In particular, older versions of Chrome do not support "tab groups" or "manifest version 3". If your browser has not been updated in several years, please update it via your browser's "About" menu. You should be using Chrome 115 or newer (which was released in July 2023). If OneTab is not working and you are prevented from updating your browser, you can download your OneTab list from an old browser using these instructions.

Safari users:   Some third-party Safari extensions have been reported to interfere with the loading of OneTab. To test this, open Safari Settings and choose Extensions. Untick all extensions to temporarily disable them, then re-enable just OneTab. If OneTab now works, you can re-enable the other extensions one by one to discover which one is causing the problem. Please note that the newer version of OneTab (with folders, search and encrypted cloud sync/backup) is only available for Chrome, Edge and Firefox due to Safari limitations.

Chromebook/ChromeOS users:   Please ensure your Chromebook is updated to the latest version of ChromeOS. You can do this by opening the ChromeOS settings and searching for "update". Google has discontinued updates for older Chromebooks. Because OneTab uses some of the newest Chrome features, it is no longer compatible with these older Chromebooks.

Bug reports:   If something isn't working as expected, you might have found a bug that we are not yet aware of. Please contact us and we can help.