Recently switched to Violentmonkey as it is a userscript extension that is open source and kept up to date. Working great so far with my existing userscripts I imported with the import feature. Had been using Greasemonkey until now but that hasn't been updated in 3 years so started to experience issues, and won't consider using Tampermonkey as it's closed source.

开源就是正义

与tempermonkey比兼容性稍有不足，但是开源且易用性更好

Works quickly and efficiently, and simple to use. One sole issue is that it sometimes needs to be turned off and on again to activate on a page.