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Firefox using over 1GB of RAM, multiple processes running and all this with only one tab open. Then it slows to a crawl, I have to close and restart FF. Rinse, repeat.

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Fix memory leak and unneeded open processes. These are not features, they are defects.

Fix memory leak and unneeded open processes. These are not features, they are defects.

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Hi

Do you have many add-ons installed in Firefox?

What OS? What version of Firefox? If windows, can we get a screenshot of the task manager performance tab?

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/