Comment by Austin Dworaczyk Wiltshire (adworacz) on Shared Cache is Going Away · 2019-11-03T18:22:19.723Z · LW · GW

It is behind a flag - if you read the commit in the bug you linked it’s defaulted to ‘false’, and controlled under the ‘browser.cache.cache_isolation’ preference setting.

https://phabricator.services.mozilla.com/rMOZILLACENTRALa5e791146ef541d794bb74ac730c0fa40985e4d4