Opera GX adds new color themes plus GX Cleaner to purge those old files

Today we are introducing new features that allow you to completely change the look of your Opera GX, while always keeping it fast and lightweight

Browsers for every device, Opera Web Browsers

Opera's GX Gaming Web Browser Goes Mobile

Light theme for Opera GX please

Firefox CSS

How To Change Theme Color In Opera GX

Opera GX - Download

Opera GX integrates CORSAIR iCUE to give a splash of color to gamers' browsing

I installed an Opera GX inspired theme, and it worked flawlessly on Windows, but on Linux Mint, the transparency isn't working. How can I fix this, if at all. : r/FirefoxCSS

Opera GX Review