Slower Tabs Scrolling with Mouse Wheel

Hello Mozilla Community! I've been at this for about two months and can simply not find a solution. I normally have 40+ tabs open in my desktop browser. I can put my mouse cursor/pointer over the tabs and using my scroll wheel shift visible tabs left or right (not actually switching to another tab). All of the sudden it seemed that when I do this the tabs just absolutely fly by. Like I can't shift just two or three tabs at a time, it's shifting 10+ tabs with just a single scroll wheel 'click'. I can see ten tabs or so and I know that what I want is just a few to the right, when i begin to scroll them the tab I want goes shooting by so far left it's gone now. I 'm left having to click the left/right arrows to move just one tab at a time, but if I click them too fast I get basically the same response. They just go flying by. How can I slow this down without also changing the vertical scroll speed of the mouse when reading long webpages? Thank you, John