It just works. Not much more to be said.

Also it supports Firefox 52 which is great!

Awaiting release notes:

https://github.com/violentmonkey/violentmonkey/issues/693#issuecomment-568563764

For security and other reasons, I always want to see notes – for updates to any extension – before allowing updates.

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Past reviews (2017):

https://web.archive.org/web/20191231092402/https://addons.mozilla.org/en-GB/firefox/addon/violentmonkey/reviews/902135/

https://web.archive.org/web/20191231091819/https://addons.mozilla.org/en-GB/firefox/addon/violentmonkey/reviews/905161/

Zero privacy. Collecting your data, sharing with unknown 3rd parties. Unacceptable.

Sync error with Dropbox for versions, and wiped out most of scripts time and time again. I cannot bear it anymore... : (

Stable, and allows pretty much all standard userscript functionality