After upgrading to Firefox 103, I've noticed the following behavior: The mouse icon does not change while moving over web pages or even the menu items and tabs. It requires a click for the mouse icon to change and for an action to take place. This causes problems because of some actions that expect a mouse hover or a click-and-hold response, which this error is preventing. For example, clicking on Google Maps and dragging to move the map is impossible. Hovering over a menu to allow it's automatic drop down to appear is also impossible. This is not consistent; when I open a new Firefox window the mouse behaves normally for a time. It does lose this ability but I don't know how quickly it happens, but after at least an hour of use, the problem is apparent. I had thought this was a problem with my extensions or themes, because the problem does not exist in private mode. But when I temporarily removed all the extensions and themes from my setup, the problem still occurred. And the fact that a new window with all extensions still active suggests that this is not caused by those extensions, or if so, not immediately.