I seem to have a problem with Firefox + Flash videos and all the titlebar buttons turning off, for about 2 seconds, and then back on

I'm pretty sure it happens whenever I view any Flash video, but this is the webpage I tend to notice the problem most often:
http://www.vinesaucevidya.com/fullscreen/

I have the page open in its own Firefox window and on my secondary monitor. I can make the problem occur all the time when I close the window, but it also happens at random whenever I am viewing a Flash video.

I uploaded my log file with 'Important' logging enabled.

I notice titlebar flickering at (roughly) the following intervals from the first display of Displayfusion's titlebar buttons:

25s
30s
40s
60s
70s
75s

and a few more while attaching the log to this post

here you go

I haven't notice the problem since

Thanks!