https://connect.mozilla.org/t5/discussions/why-is-firefox-v145-0-using-so-much-cpu-after-the-update/m-p/112040#M43327 <P><STRONG>Hey Firefox community,</STRONG></P><P>Since updating to Firefox 145.0 on Windows 11, I've been experiencing persistent high CPU usage, even with just a few tabs open. My laptop fan runs constantly, and overall performance has noticeably degraded, particularly when streaming YouTube videos or browsing other media-heavy <A href="https://alightmotionlab.pro/" target="_blank" rel="noopener">sites</A>.</P><P><STRONG>Troubleshooting Steps I've Already Taken:</STRONG></P><UL><LI>Disabled all extensions and tested in Safe Mode with no improvement</LI><LI>Cleared cache and cookies but CPU usage remains high</LI><LI>Scanned for malware and system is clean</LI><LI>Created a fresh Firefox profile but issue persists</LI></UL><P>Has anyone else encountered this after the update? I'd really appreciate any suggestions or potential fixes!</P><P><STRONG>System Details:</STRONG></P><UL><LI>OS: Windows 11 (fully updated)</LI><LI>Browser: Firefox 145.0</LI></UL><P>Thanks in advance for your help!</P> Wed, 03 Dec 2025 20:51:58 GMT calce 2025-12-03T20:51:58Z https://connect.mozilla.org/t5/discussions/why-is-firefox-v145-0-using-so-much-cpu-after-the-update/m-p/112040#M43327 <P><STRONG>Hey Firefox community,</STRONG></P><P>Since updating to Firefox 145.0 on Windows 11, I've been experiencing persistent high CPU usage, even with just a few tabs open. My laptop fan runs constantly, and overall performance has noticeably degraded, particularly when streaming YouTube videos or browsing other media-heavy <A href="https://alightmotionlab.pro/" target="_blank" rel="noopener">sites</A>.</P><P><STRONG>Troubleshooting Steps I've Already Taken:</STRONG></P><UL><LI>Disabled all extensions and tested in Safe Mode with no improvement</LI><LI>Cleared cache and cookies but CPU usage remains high</LI><LI>Scanned for malware and system is clean</LI><LI>Created a fresh Firefox profile but issue persists</LI></UL><P>Has anyone else encountered this after the update? I'd really appreciate any suggestions or potential fixes!</P><P><STRONG>System Details:</STRONG></P><UL><LI>OS: Windows 11 (fully updated)</LI><LI>Browser: Firefox 145.0</LI></UL><P>Thanks in advance for your help!</P> Wed, 03 Dec 2025 20:51:58 GMT https://connect.mozilla.org/t5/discussions/why-is-firefox-v145-0-using-so-much-cpu-after-the-update/m-p/112040#M43327 calce 2025-12-03T20:51:58Z