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Browser window slides sideways

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When I open a new browser window the page slides sideways, how do I turn this effect off? It never did this before, and it is extremely annoying.

The new window appears to slide from the left side of the screen across the screen until it is fully visible; that's what I am trying to describe. As if a card was being dragged out of the left side of the screen, across the page. I hope someone knows how to make this animation stop, please?

When I open a new browser window the page slides sideways, how do I turn this effect off? It never did this before, and it is extremely annoying. The new window appears to slide from the left side of the screen across the screen until it is fully visible; that's what I am trying to describe. As if a card was being dragged out of the left side of the screen, across the page. I hope someone knows how to make this animation stop, please?

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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 on the about:config page to show (0) or block (1) some animations.

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