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How do I fix Firefox 154 update making my older Windows 10 laptop run so slowly?

I had automatic updates turned on for Firefox on my older Windows 10 Thinkpad. Update 154 (64 bit) has made my machine fail to connect, run very slowly on loading sites … (read more)

I had automatic updates turned on for Firefox on my older Windows 10 Thinkpad. Update 154 (64 bit) has made my machine fail to connect, run very slowly on loading sites and caused mailchimp to malfunction. I have already spent hours trying to undo all the damage, but the sites are still loading very slowly. Can an update be reversed easily? Do I just need to change some settings? I have cleared cache and site data several times over, set tracking to standard and added mailchimp to ublock exceptions. What else can I try?

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