@killyourfm that doesn't sound right, afaik that shouldn't use that much RAM...
Have you tried things like Franz and Ferdium, they are embedded chromium Browsers for things like slack, WhatsApp and discord; electron Apps with a web equivalent, gets you most of 5h3 way to a desktop app without needing multiple instances of electron, and as a bonus, they don't share cookies/information afaik.
@killyourfm Wow, whenever I get close to that usage (my system only has 24GiB of RAM), it's because I wrote a memory leak (or allocated too much memory).