Tampermonkey Alternative Page

Firemonkey attempts to combine userscript management with userstyle (CSS) management.

It started with a single pop-up. Not an ad—worse. A nag screen inside my developer tools: "Tampermonkey has been updated. Please review the new permissions." tampermonkey alternative

As the original userscript manager, Greasemonkey is exclusive to Firefox. It is open-source and highly regarded for security. tampermonkey alternative