I have noticed a recent behaviour with Firefox. The firefox window and web content will hang or freeze momentarily. The mouse cursor will move over the window but not change when over a link. Arrow or page up/down keys are cached. After a few seconds, the web page acts normally - links are clickable, any key strokes that were get executed. Not sure what the cause is but it is recent.
This is on a fedora 40 workstation, nvidia card with rpmfusion-based driver. All rpms current.
This mildly annoying only.
best regards