Animated GIFs are antialiased in Chrome but not Firefox or Edge - google-chrome

I have some icons that are set to animate on hover (so there are two images per icon, a static PNG and an animated GIF). Since the icons are meant to be responsive, I'm using Bootstrap's img-fluid class on each img element.
In Chrome, both the static image and the animated version display properly - edges are smooth and antialiased. In Firefox and Chrome, however, the animated GIFs appear pixelated and I have no idea why. Is this simply due to how each browser renders resized images, or is there a way I can fix it?
Codepen sample here - hover over each icon to see what happens. In Firefox and Edge, there's a noticeable jump between the smooth-edged static PNG and the pixelated GIF. This doesn't happen in Chrome.
If it matters, my versions of each browser are:
Firefox 65.0.1
Microsoft Edge 44.17763.1.0
Google Chrome
72.0.3626.119
Help much appreciated.

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As you can see the right and bottom edge of image seems to be cut-off. But the same icons renders properly in all other browser including IE, FF, Safari.
Following is the screenshot of mozilla for the same.
Actually icons are of very big size around almost 1000 X 1000px, and I'm showing that in 100 X 100px area. The problem is I can't scale down the images and I have to use these images only.
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Thanks for your time!!
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