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CPU/RAM Usage Way Too High

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Firefox, according to its own Task Manager, shows the browser, not extensions, or particular tabs, using 9GBs of RAM, and 95-120% CPU Usage! This is causing everything to work, as if underwater, typing is slow, hesitates, etc, and opening new tabs sometimes doesn't even happen, and I have to try multiple times, etc. There is no reason Firefox should be using over 100% of my iMac's CPU. Meanwhile, nearly every single open tab is showing less than 1% CPU usage...

I really do want to use this browser, but this kind of memory sucking usage is making really difficult to continue doing.

Firefox, according to its own Task Manager, shows the browser, not extensions, or particular tabs, using 9GBs of RAM, and 95-120% CPU Usage! This is causing everything to work, as if underwater, typing is slow, hesitates, etc, and opening new tabs sometimes doesn't even happen, and I have to try multiple times, etc. There is no reason Firefox should be using over 100% of my iMac's CPU. Meanwhile, nearly every single open tab is showing less than 1% CPU usage... I really do want to use this browser, but this kind of memory sucking usage is making really difficult to continue doing.

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