Hello, I was hoping someone could help explain an odd thing I have been seeing for a split secound while using Firefox. Currently using the newest version of Firefox but have been noticing this happen for the last few months. While using Firefox I will see a white box flash in the upper right of the Firefox window for a few milliseconds. I had to do a screen recording the slow down the recording down wish was a pain but I did capture it and included a screen grab below. I am running add-on's (Three Ad-Blockers) which I do use day to day but have independently removed them and still see the flashing. Thanks for your time and assistance...