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Only one Profile and can't make any changes in "about:config", Is always updating and slowing performance

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Please continue here: [/questions/1271976]
I refreshed FF 70 because of slow performance and it didn't change anything. I had two profiles (one was Dev profile?) that I deleted. Want to stop Automatic Install to see if that speed things up. When I start FF and go to options I always see the Win10 Blue circle indicating a check for updates. Tried to change it in "about:config" from TRUE to FALSE but it always changes back. FF is slow, slow,slow. Please help. Thank you...Tom

<i>Locking this thread.</i><br><i>Please continue here: [[/questions/1271976]]</i><br> I refreshed FF 70 because of slow performance and it didn't change anything. I had two profiles (one was Dev profile?) that I deleted. Want to stop Automatic Install to see if that speed things up. When I start FF and go to options I always see the Win10 Blue circle indicating a check for updates. Tried to change it in "about:config" from TRUE to FALSE but it always changes back. FF is slow, slow,slow. Please help. Thank you...Tom

Modified by cor-el