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Something is clearly off with YouTube right now, and plenty of users have felt it before they knew what to blame. A video starts fine, then the tab turns heavy, playback begins to stutter, scrolling lags, and the whole browser suddenly feels like it is dragging a piano uphill. What looked at first like a browser problem is increasingly pointing back to YouTube itself.
Over the past several days, reports have spread across Reddit and browser support forums from people seeing YouTube tabs freeze, consume absurd amounts of memory, and hammer the CPU during ordinary viewing sessions. In some of the most extreme cases, a single tab has reportedly climbed past 7GB of RAM usage, which is enough to cripple weaker machines and make even powerful desktops feel unstable.
Developers digging through Mozilla Bugzilla say the culprit appears to be a layout rendering loop tied to YouTube’s interface under the video player. The issue involves the row of action buttons such as Like, Share, and Save. When there is not enough horizontal room to display every button, YouTube tries to hide one.
That should have been routine. Instead, it seems to trigger a messy chain reaction. Once a button disappears, the menu container becomes just wide enough for YouTube to think the button can fit again. So the interface puts it back. Then the row overflows again. The button is hidden again. The space changes again. And the whole process repeats rapidly, over and over, forcing the browser to recalculate and redraw the page almost nonstop.
That loop is where the performance collapse begins. Memory usage rises. CPU load follows. The tab becomes sluggish or nearly unresponsive. For users watching long videos, multitasking, or running multiple tabs, the effect can be dramatic.
Not just Firefox, and not just one setup
Early suspicion fell on Firefox, especially after some users linked the slowdown to recent updates or content blockers. That theory did not last long. Similar complaints soon surfaced from people using Brave and Microsoft Edge, which suggests the problem is not isolated to a single browser engine. Both Firefox-based investigations and Chromium-based user reports appear to be circling the same YouTube-side behavior.
That matters, because it shifts the story from a niche compatibility glitch to something broader: a bug in a heavily used web interface that can affect different browsers in similar ways. Mozilla developers are examining the problem from their side, but so far there has been no public fix or formal acknowledgment from Google or YouTube.
There is, however, a temporary workaround for people using uBlock Origin. By blocking the ytd-menu-renderer element with a custom filter, users can disable the problematic button strip beneath the player. It is not elegant, and it removes quick access to actions like Like or Share, but it appears to stop the rendering loop and restore normal performance.
For now, if YouTube has suddenly started eating memory and pushing your browser to the edge, you are not imagining it. This is not just another vague slowdown with no clear cause. All signs point to a YouTube UI bug that is turning a simple row of buttons into a resource-hungry mess.
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