Well... Those macbooks with their set amount ram and there is nothing you can do about it. I bought a '''2012 with 16gb of ram'''. It's still gets the job done, but when I need to have several things open it struggles. See if this helps. '''''Firefox's Project Fission:''''' Introducing Firefox’s new Site Isolation Security Architecture https://hacks.mozilla.org/2021/05/introducing-firefox-new-site-isolation-security-architecture/ Firefox's Project Fission: better security and more processes https://www.ghacks.net/2019/02/07/firefoxs-project-fission-better-security-and-more-processes/ You can try Firefox's Site Isolation feature Fission in Nightly now https://www.ghacks.net/2020/09/20/you-can-try-firefoxs-site-isolation-feature-fission-in-nightly-now/ Change how many processes multi-process Firefox uses https://www.ghacks.net/2016/02/15/change-how-many-processes-multi-process-firefox-uses/