So far this rulez :-) I have started by installing "top and bottom buttons on every page" - yeah I know there is separate extension but I got to know this afterwards. Anyway idea is really cool ;-)

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

Completely breaks web page functionality (i.e. youtube) causing unpredictable behavior.