Hello! Reproduced the issue with Firefox 104.0a1 (2022-07-15) on Windows 10x64. After loading the page and scrolling it a bit the RAM memory increases very rapidly to the maximum for the Firefox process. Using Firefox 108.0b2 on Windows 10x64, macOS 11, and Ubuntu 20.04 and visiting the webpage from comment 0 will keep the memory usage stable while scrolling the webpage.
Bug 1778237 Comment 22 Edit History
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Hello! Reproduced the issue with Firefox 104.0a1 (2022-07-15) on Windows 10x64. After loading the page and scrolling it a bit the RAM memory increases very rapidly to the maximum for the Firefox process. Using Firefox 108.0b2 on Windows 10x64, macOS 11, and Ubuntu 20.04 and visiting the webpage from comment 0 will keep the memory usage stable while scrolling the webpage and the video is playing.