I use firefox 66.0.2 (64-bit) with ubuntu 18.10, but in the add-ons of Gesturefy(https://addons.mozilla.org/en-US/firefox/addon/gesturefy/), I have been told “This add-on requires a newer version of Firefox (at least version 63.0). You are using Firefox 60.0.”, what’s wrong with it?
You probably have overridden your user agent somehow, either by resisting fingerprinting or by using an extension etc.
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