The 'F5' key will refresh the contents of any webpage in Firefox. Try that if it is not updating automatically.
There may be an option to always refresh when you load and that is what mine does, but I don't immediately see one.
If you look under options (click on the three horizontal lines just under the x button top RH corner to close Firefox and then click on the options icon) and then the advanced tab there are a couple of options for how the scrolling works. Try it till you get what you want.
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Ford Explorer or Chrysler 300C to tow with.
Tracer Air 238 to be towed.
Triumph Thunderbird Sport - with the toy-hauler gone it's at home.
Retired very early and loving it.