I see. Thank you for a clarification!

I used Firefox for decades, and now test out forks like Librewolf and Fennec. Sometimes I use Vivaldi if I go chromium.

I usually go for budget phones, whilst my home laptop is 10 y.o. Never had an issue with performance.

Well. I did when I overused redundant extensions, but now I know better:)

Pardon my ignorance, what’s a XUL Gecko?