Thank you for your questions, @jamesban. A Netskope expert from our community team will get back to you as soon as possible. In the meantime, if any community member knows the solution, please reply to this thread!

There are two chrome extensions, one is published in the Netskope tenant and the other is published in the Chrome public extension store. The first is used for developing custom app connectors by analyzing web traffic and helping map activities to a Netskope activity object. The second is for a unique "explicit proxy only" use case that would be better for you to discuss with your solutions engineer.  The context is primarily for managed devices/MDM/domain attached, IE windows/mac devices that are unable to install the client but do need browser-based access which is a very limited "exception" scenario and not our best practice. For chromebook support we do have documentation, it is not related to the chrome extension: https://docs.netskope.com/en/email-invite.html#UUID-4612881d-15a2-ac7b-479c-87917f539005_section-5dd6c76273e5d-idm44771244231008