That's a very good question. Manifest V3 changes heavily impact Requestly because we use webRequest API to intercept the network requests. We have already started evaluating what works and what not.
A couple of things which I see right away not being supported directly in Manifest V3 are like adding a random parameter to URL to avoid caching, Inserting a script before page load etc.
Apart from this, from a couple of folks whom I know have migrated to Manifest V3 their users have faced some issues So I'd be most likely wait for another 4-5 months before doing the migration. Do you have any pointers for v2 to v3 migration?
Thanks for the tip about the Linux page.