https://connect.mozilla.org/t5/discussions/after-using-firfox-for-a-number-of-hours-my-cpu-useage-increases/m-p/117323#M45873 <P>After using Firfox for a number of hours, my CPU usage increases over time until it is eventually at 100 % and everything get sluggish.&nbsp; I used to run Firefox for days without needing a restart, now I restart several times a day.&nbsp; So, this must be related to some new feature or code that was added in the past few months.</P><P>I also used to be able to have 50 to 70 tabs open in one Window and 2 other Windows open.&nbsp; Now I close&nbsp; tabs constantly and run only one Window with 30 or 40 tabs.</P><P>My computer is an HP Laptop Intel i5 4TB,24GB of Ram,&nbsp; about 8 years old, but it is the same one I was using when this problem did not exist.</P><P>thanks you for all your hard work to keep Firefox the best browser out there.</P> Wed, 04 Feb 2026 07:34:23 GMT John72980 2026-02-04T07:34:23Z https://connect.mozilla.org/t5/discussions/after-using-firfox-for-a-number-of-hours-my-cpu-useage-increases/m-p/117323#M45873 <P>After using Firfox for a number of hours, my CPU usage increases over time until it is eventually at 100 % and everything get sluggish.&nbsp; I used to run Firefox for days without needing a restart, now I restart several times a day.&nbsp; So, this must be related to some new feature or code that was added in the past few months.</P><P>I also used to be able to have 50 to 70 tabs open in one Window and 2 other Windows open.&nbsp; Now I close&nbsp; tabs constantly and run only one Window with 30 or 40 tabs.</P><P>My computer is an HP Laptop Intel i5 4TB,24GB of Ram,&nbsp; about 8 years old, but it is the same one I was using when this problem did not exist.</P><P>thanks you for all your hard work to keep Firefox the best browser out there.</P> Wed, 04 Feb 2026 07:34:23 GMT https://connect.mozilla.org/t5/discussions/after-using-firfox-for-a-number-of-hours-my-cpu-useage-increases/m-p/117323#M45873 John72980 2026-02-04T07:34:23Z