Как и Greasemonkey - хороший менеджер скриптов, но более ограниченный, чем Tampermonkey.

Not working. POS.

It may cause memory leak when visit some website on firefox，such as Bing

had to finally switch to tampermonkey. i migrated from greasemonkey following the user script breakage after their 4th version update, now it seems that violentmonkey followed suit, resulting in many scripts not functioning anymore.
also their privacy statement gave me the creeps..

Privacy nightmare. Avoid like the plague if you are privacy concious.