Does spawning new incognito sessions mitigate this? I know for me I have set all my various browsers to use incognito mode by default, so all my sessions are insulated from each other and can't 'talk' to each other. For sessions where I need to be logged in/use cookies, I have a dedicated Firefox profile that I launch with the `-p` switch in the launcher icon, and I never do anything sensitive in this session, so I don't care about secrets being leaked into that session.