Has anyone noticed odd behaviour in Firefox?

Mozilla-Firefox 115.5 was included in the update I carried out on the 19th. And I have just seen some really odd behaviour from it. Clicks on links stopped working and I could not close a tab by clicking on it, although I could still use a click to move to another tab. When I did so, the window was blank; in other words FF had lost the ability to repaint its window.

I closed FF and reopened and everything seems to be normal again. I've never seen anything like that before.