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 installed OneTab in one profile and then switch to a different profile, the OneTab icon won't appear.

Data lost/corrupted:   If your computer or browser has crashed, or if you have sudden power loss, on rare occasions this can cause your browser's database to become corrupted. When the database becomes corrupted, your browser will often automatically delete and recreate it, so that the browser is still functional.

Since OneTab data is stored in your browser's database, this would also cause OneTab data to be lost. If you don't use our backup/sync feature, then the only way to recover the deleted data is if you run 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. We're very sorry if this has happened to you - we have been working on an encrypted backup/sync feature (coming soon) so that this can't happen to you in the future.

Firefox users:   If you suddenly don't see your tabs in Firefox, do you remember recently being asked if you want to "Refresh Firefox"? This is a prompt shown to you when you upgrade to a new Firefox version (there is a new Firefox version released every month). Unfortunately, this feature wipes all add-on storage - including OneTab's storage. If you don't use our backup/sync feature, then the only way to recover the deleted data is if you run backup software on your computer that can restore your Firefox profile folder.

Older versions of Chrome and Chrome-based browsers:   OneTab uses some of the newest browser features, which may mean that out-of-date browser versions are incompatible. In particular, older versions of Chrome do not support "tab groups" or "manifest version 3". If your browser has not been updated in months or years, please update it by going to your browser's "About" menu. You should be using Chrome 115 or newer. 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.

Opera and Opera GX users:   OneTab is now compatible with Opera's "tab islands" feature (known as "tab groups" in Chrome). Please update to the latest Opera version. Please note that Opera GX has a bug where the OneTab page may not appear at first, and you will need to fully quit and restart Opera GX for it to work.

Safari users:   It has been reported that some third-party Safari extensions can interfere with the loading of OneTab. To test this, go to the Safari Settings, then choose Extensions. Untick all extensions to temporarily disable them, then re-enable just OneTab. If OneTab is working, you can then re-enable other extensions one-by-one, to discover which extension 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 going to the ChromeOS settings, and searching for "update". Google has discontinued updates to older Chromebooks. OneTab uses some of the newest Chrome features, which means it is no longer compatible with 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.