Since the update Firefox automatically made today (version 64.0) on my computer (Windows 10), my middle mouse click is not working anymore. It doesn't open the link in a new tab like it should ; I've checked the settings in about:config like someone said last time someone asked about this (in 2017), but everything is as it should if it worked (apparently). I've got no special plugins (none that could affect that) or add-ons. Can you help ? I'm really used to this shortcut..

PS: It doesn't work anymore for the fast scrolling up or down.. And on Chrome or anything else neither. I'm beginning to consider my mouse as the problem !