I have one svg but it looks differently on Chrome and Firefox: http://codepen.io/anon/pen/OParwx.
svg {
fill: black;
stroke: black;
width: 40px;
height: 40px;
}
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0,0,48.266,51.827">
<g>
<path d="M16.69 41.827c-2.763 0-4.975 2.237-4.975 5s2.212 5 4.975 5c2.763 0 5-2.237 5-5s-2.237-5-5-5"/>
<path d="M40.19 41.827c-2.763 0-4.975 2.237-4.975 5s2.212 5 4.975 5c2.763 0 5-2.237 5-5s-2.237-5-5-5"/>
<path d="M26.768 20v-20 20z" stroke-width="5" stroke-miterlimit="10" fill="none"/>
<path d="M36.768 10h-20 20z" stroke-width="5" stroke-miterlimit="10" fill="none"/>
</g>
<g>
<path d="M0 5.059h6.406l10.99 22.455h20.469l10.401-18.777" stroke-width="5" stroke-miterlimit="10" fill="none"/>
<path d="M45 37.689h-29.947s-3.594.077-2.579-4.036l4.923-6.139" stroke-width="5" stroke-miterlimit="10" fill="none"/>
</g>
</svg>
Here's how they look like
Chrome
Firefox
What makes them different and how to fix it?
Edit: a temporary solution (besides waiting for the bug is fixed on Firefox 37) is to remove stroke-miterlimit and add stroke-linejoin="bevel"