Marquee should be working in Firefox 130. Does this data URI work?

data:text/html;charset=utf-8;base64,PG1hcnF1ZWUgc3R5bGU9ImZvbnQtd2VpZ2h0OiBib2xkOyBmb250LXNpemU6IDE2cHQ7IGNvbG9yOiByZ2IoMywgMTQsIDE0Myk7IGZvbnQtZmFtaWx5OiBBcmlhbCBCb2xkOyIgc2Nyb2xsYW1vdW50PSIzIiBzY3JvbGxkZWxheT0iMTAwIiBiZWhhdmlvcj0iYWx0ZXJuYXRlIiB3aWR0aD0iNzY4IiBoZWlnaHQ9IjI4Ij5zY3JvbGxpbmcgdGV4dCBoZXJlPC9tYXJxdWVlPg==

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl+F5" or press "Ctrl+Shift+R" (Windows,Linux)
• press "Command+Shift+R" (Mac)

No your given URL not working on latest update on firefox. for your better judgement i have share a video link with a attachment . Please check.

Issue Related Video Link

No, Your given URL not working on my firefox, where in chrome its working fine. I have share a video link to you for your better judgement. Please check.

Issue related video link

Could this feature:

Firefox 63+ has support for "@media (prefers-reduced-motion)" to honor System Settings to minimize the amount of non-essential motion. You can create a new Number pref named ui.prefersReducedMotion in about:config to show (0) or block (1) some animations.

• set the value to 1 if you want to block animations
  ui.prefersReducedMotion = 1
• set its value to 0 if you want to see animations
  ui.prefersReducedMotion = 0
• in Firefox 78+ this includes the location bar breakout
• in Firefox 80+ this replaces the tab loading indicator with an hourglass

See also:

• https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion

Yes, now working. But can you make it automatically? General user may not able to do to configure his/her firefox like this, like my client. It will bad impact on firefox user , i think. Please fix it. Thanks

By default, animations aren't blocked by Firefox. You can't affect this, it's a user's choice whether they wants to see animations or block them and only see the first frame.