After starting Firefox, dropdown menus on websites have a delay of several seconds before the data appears and I can click. The problem disappears after a number of dropdowns are used. It doesn't matter which sites, it's some arbitrary number of selections and then the problem goes away and everything is fine until the next startup of Firefox. Menus in Firefox were not affected. Because it goes away, I've just been putting up with it. Since v109, the problem has expanded to include all menus in Firefox as well. Same lag effect, but it appears longer now and has become a serious issue with productivity. I'm running Windows 10 on an average machine. Thanks for any help.