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"FirefoxCP Isolated Web Content" Using Tons of Memory and Slowing Down MacBook Pro

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Recently, Firefox on my MB Pro (M1) has been freezing up or drastically slowing down due to "FirefoxCP Isolated Web Content" processes (multiple). What is this? How do I fix it? Is this a deal breaker for using Firefox as my default Mac browser?

Recently, Firefox on my MB Pro (M1) has been freezing up or drastically slowing down due to "FirefoxCP Isolated Web Content" processes (multiple). What is this? How do I fix it? Is this a deal breaker for using Firefox as my default Mac browser?
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