Bug in interaction between uMatrix and Snowflake (snowflake-webextension)
Error in Snowflake debug console, caused by a line in vapi-background.js in uMatrix:
Unchecked lastError value: Error: First-Party Isolation is enabled, but the required 'firstPartyDomain' attribute was not set.
The uMatrix setting causing this error is:
Spoof HTTP referrer string of third-party requests, when set to true.
This is a bug either in Snowflake, or uMatrix.