I\'m using Firefox Browser, tried all PNG\'s, JPG\'s and all were working, except GIF.
Here\'s the thing, if I test
Your gif should work in an img-tag. If you upload your code to a server you have to change the path from localhost to anything other, maybe this causes the problem.
img {
height: 200px;
width:auto;
}
<img src="https://im3.ezgif.com/tmp/ezgif-3-0a7fd40adb02.gif" alt="test">
This is most likely to be caused by an ad-blocker or extension.
Try disabling them 1 by 1 and see if the image loads.
Or try an incognito browser.