Firefox sluggish / jittering jquery (or css3?) animation

I had a browser based problem with Firefox yesterday where my animation wasn’t running smoothly, even the latest version, but it was running fine in Chrome and Safari.

I searched online for a bit but didn’t find a solution. I was, at the same time, trying to remove the dotted line that’s displayed when clicking a link in Firefox.

After some trial and error it turne out both things were solved by the same thing.

Solution:
In css add:

a:focus{
 outline:none;
 }

FIXED!

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