I'm afraid I'm not aware of a workaround, no. The site is using a non-standard event that was never guaranteed to continue working. It also appears that the site is using the non-standard `mousewheel` event for non-Firefox browsers. Beyond the site updating to use standard web APIs, the only workaround I can discover is to move your mouse down below the video element to the player controls, and to use the mouse wheel there.
Bug 1590883 Comment 5 Edit History
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I'm afraid I'm not aware of a full workaround, no. The site is using a non-standard event that was never guaranteed to continue working. It also appears that the site is using the non-standard `mousewheel` event for non-Firefox browsers. Beyond the site updating to use standard web APIs, the only workaround I can discover is to move your mouse down below the video element to the player controls, and to use the mouse wheel there.