If you're dealing with SVG icons on a daily basis, I highly recommend you grab Gapplin on the Mac App Store.
It's a SVG viewer, but it also adds a QuickLook plugin, meaning you get previews of SVGs in the Finder, and this is *amazing*.
And it's free!
I found out about and started fiddling around #ORCΛ and it's low-key blowing my mind, I might get into this...
Great news! Firefox 64 *finally* supports the styling of scrollbars using CSS 💥
Apparently this was added in mainline Mastodon but if (like me) you're on a non-mainline instance, you can add the following CSS using Stylus to have them fancy scrollbars! ✨