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How do Greasemonkey and Tampermonkey compare? I've only used Greasemonkey on Firefox and Tampermonkey on Chrome. But they both exist on Firefox and there's like no sources on which has the best performance / features or the history between them.
Re: @XFoxPrower:
I've found a review of tampermonkey for firefox in
https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/reviews/ ,
entitled "A mixed bag" by flash82 - (tl;dr), read it if you're interested