One account per browser profile
Why each browser profile (Chrome, Firefox desktop, or Firefox Android) links to one ZetaMarker account, and what to do if you see "Another user uses this device."
Each browser profile can sign in to one ZetaMarker account in the extension. That includes:
- Chrome (and other Chromium) profiles
- Firefox desktop profiles
- Firefox for Android profiles
If you used account A on this profile before, signing in with account B is blocked. You may see:
Another user uses this device.
Why we do this
Local highlights on this device stay in your browser. Binding the profile to the first account that signed in helps prevent those highlights from being synced to someone else's cloud account by mistake.
This protects your reading notes on shared or personal devices.
Sign out does not switch accounts
Logging out of the extension pauses cloud sync but does not remove the link to the original account. You can sign back in with the same account anytime.
To use a different ZetaMarker account on this device, use a separate browser profile, or another browser.
What to do
| Situation | What to do |
|---|---|
| You want your usual account back | Sign in with the same email or Google account you used before |
| You want a different account here | Use another browser profile or browser |
| You see the message after trying a new account | Expected — see the rows above |
| You deleted your account and signed up again with the same email | Sign in again from the extension with the same email or Google account. See Delete your account — especially Signing up again and Extension after re-signup. Do not uninstall the extension. |
After deleting your account
If you delete your account and later create a new one with the same email, you are signing into a new account. Cloud data from the old account cannot be restored.
For the full picture — local highlights, Pro trial rules, extension sign-in, and subscriptions — see Delete your account.
Related
Sign in from the extension
Log in to ZetaMarker from the desktop sidebar or Firefox Android Settings to enable cloud sync, the dashboard library, and cross-device highlights.
Local highlighting vs cloud sync
What ZetaMarker can do without an account versus what requires a Pro trial or subscription with cloud sync enabled.