The menu bar keeps flashing about every 5-10 seconds. When it does it disrupts / interrupts whatever I'm typing, deleting everything I've typed when the flash occurs. It also disrupts things like using a drop down menu. The menu is opened (aka dropped down) but when the flash occurs it collapses the drop down menu. Also for example en typing; let's say I'm typing " Mary had a little lamb". After typing "Mary had a" the Menu bar flashes. When it does "Mary had a" gets deleted. As I continue to type not knowing "Mary had a" was deleted I look up and see all that's left is "little lamb". It's constantly doing this even while typing this message / question. If copy and pasting it'll clear the text I've chosen to copy so I have to go back and re-select it. And try to get it done quickly before the next flash occurs. But if the next flash occurs the same thing happens all over again. I have no idea what's going on. Searched and searched and can't find anything. It's making Firefox almost impossible to use. Please help me?! I'm using Firefox version 115.18.0esr It is up to date.