Beginning with Firefox beta build 98.0b2, Symantec observed an intermittent code injection failure issue that prevented monitoring with Symantec Data Loss Prevention 15.8 on Windows endpoints.

These intermittent failures did not occur with the Firefox 99 stable release and monitoring functionality was certified. However, with more recent Firebox beta builds, the intermittent issue has been observed again.

Symantec is monitoring the situation and will continue testing Firefox beta builds. For the most recent updates, see Browser beta compatibility and testing at the Symantec Data Loss Prevention 15.8 Help Center.

April 4, 2022 update: See DLP 15.8 not monitoring Mozilla Firefox 99 stable release on Windows endpoints.