Aurora is based on Fedora Kinoite, a RHEL-type system; you're looking at Debian-type info in that link. Have a look to the Fedora docs to learn how grub is managed in this ecosystem: https://docs.fedoraproject.org/en-US/fedora/latest/system-administrators-guide/kernel-module-driver-configuration/Working_with_the_GRUB_2_Boot_Loader/
(x-posted comment) There’s a MV3 alternate (same dev!) “uBlock Origin Lite” which this article completely misses out on mentioning: https://chromewebstore.google.com/detail/ublock-origin-lite/ddkjiahejlhfcafbddmgiahcphecmpfh
There are certain websites and tools which need chrome/chromium making it a necessary evil; for example there’s a new trend in firmware flashing of devices like ESP32 boards and HAM/GMRS radios which are web based and use Chrome tech. This new MV3 fork isn’t as good as the original but it’s better than nothing and does stop some ad trash.