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Find Sval's log file

Sval writes its warnings and errors to a file called sval-log.txt in its data folder. The log never includes a Workspace, group, or tab name, a web address, a file path, or a secret.

Sync stopped working on one of your computers, and you want to see what Sval logged before you report it.

Steps

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  1. In the address bar, type about:support and press Enter.
  2. Under Application Basics, find Profile Folder (Profile Directory on Linux).
  3. Select Show in Finder (Open Folder on Windows, Open Directory on Linux).
  4. Open sval-log.txt.

Details

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  • When sval-log.txt gets full, Sval renames it sval-log-old.txt and starts a new one. The two together stay under 1 MB.
  • The log keeps warnings and errors from Sval and from the browser’s own code.
  • The feedback form sends recent lines from the log as Sval’s error log. You can view or uncheck it there. See Send feedback.
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© 2026 Ellm Tree, Inc. Sval is not officially associated with Mozilla or its products. Firefox is a trademark of the Mozilla Foundation in the US and other countries.