What integration options exist with the Island enterprise browser?
It is not officially supported by DLP at this time
Island does have direct integration settings for Symantec DLP
There is also an Island browser extension for Chromium browsers. This has the potential to interfere with the Symantec DLP extension and it must be configured with DLP functionality in mind, such as considering disabling the Island browser extension clipboard functionality if you are monitoring browsers with the Symantec DLP extension.
A feature request has been submitted for official support