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1

DarwinsCousin wrote

Firefox now also bans extensions being used on certain tabs, e.g. new blank tabs

That's not true, see this extension for example (compatible with Firefox 57+) https://addons.mozilla.org/en-US/firefox/addon/new-tab-override/

2

321 wrote

OK, so maybe in time someone will make a mouse gestures extension that will work on new tabs. But still, I don't think extensions can work when browsing addons.mozilla.org, so mouse gestures will fail there.