I have noticed that my mouse becomes unresponsive exclusively when clicking Browser items in Firefox 124.0.2 (64-bit) on Mac OS Sonoma 14.4.1 usually everything is fine for a while, then after a small working period I can still hover over items in Firefox but any click action (right or left) is ignored by Firefox or pages in Firefox. At the same time clicking in other apps is still working fine. When restarting firefox the functionality often re-occurs and works again for a certain time.