How do I fix low res custom tab panel icons?

[Reziem]

No matter the resolution of the icon I use or the format of the icon it always looks blurry in the panel. What am I missing here? The default icons look great but no matter the type of icon I find online they all look blurry.

I have a dedicated reddit tab panel and want to use the reddit alien as the icon.

[ChilledMoth]

Try using SVG icons if you are currently using JPG or PNG icons.