If your browser has felt unusually sluggish on YouTube lately, you’re not imagining it. Reports have been piling up across Reddit and browser forums over the past week from users noticing frozen tabs, stuttering videos, and overall performance tanking mid-watch. Turns out, it’s a YouTube browser bug. According to developers digging through Mozilla’s Bugzilla bug tracker , the issue traces back to a rendering loop inside YouTube’s interface. The row of buttons below the video player (Like, Share, Save, and the rest) collapses automatically when the screen lacks enough horizontal space for all of them. The problem starts when hiding one of those buttons slightly widens the menu container. That tricks YouTube’s code into thinking there’s now enough room, so it adds the button back. That causes an overflow again, YouTube hides the button again, the container widens again. The cycle repeats at high speed, forcing your browser to constantly recalculate and redraw the layout.…