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The point is the browser just plays the mp4 with autoplay and looping and then people call them GIFs when they aren’t. The only time you are looking at an actual GIF file is when the quality is atrocious and the colors are messed up because it needed to be dithered.
You sure it isn’t crypto mining malware that will hide when task manager is open? Like the one described here.
CryptoCurrency Miner Plays Hide-and-seek with Popular Games and Tools

When the CPU utilization on a computer is high, games become less responsive, frame rate goes down, and gameplay stutters. To diagnose these problems, users will commonly open process manager utilities such as Task Manager, Process Explorer, or Process Hacker to determine if any processes are using too much of the CPU power.

BleepingComputer