I saw a recommendation to use Firefox’s container extension https://support.mozilla.org/en-US/kb/containers, but it’s disabled in private browsing windows, and I always use private browsing windows.
Then just… enable the containers in private tabs? The option is right there in the extensions menu.
Non-native English speakers don’t have this problem because they actually learn proper English. The problem is people who speak it naturally and don’t give a damn about proper English. After a certain point it becomes less inclusive to spew out near unreadable gibberish like the beginning of your reply.