Supports GM 4 userscripts and some GM 3

Greasespot

The weblog about greasemonkey

Supports GM 4

Releases · janekptacijarabaci/greasemonkey

Greasemonkey is a user script manager for firefox janekptacijarabaci greasemonkey

Supports GM 3

FireMonkey – Get this Extension for 🦊 Firefox (en-US)

Download fire monkey for firefox super lightweight user script and style manager

Tampermonkey for Chrome

Tampermonkey is a free browser extension and the most popular userscript manager it s available for chrome microsoft edge safari opera next and firefox even though some of the supported browsers have native userscript support tampermonkey will give you much more convenience in managing your u

Supports both GM 3 and GM 4

usi (User|Unified Script Injector) – Get this Extension for 🦊 Firefox (en-US)

Download usi user unified script injector for firefox use user scripts on your firefox for android with usi

Supports some GM 3

Violentmonkey

An open source userscript manager

Supports both GM 3 and GM 4