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(from mail conversation)

Is is "unbelievable" but true: Firefox does not show scroll bars if the height of a TEXTAREA is defined lower than 60 pixels. Seems that the strategy is: if there is no space available for showing the minimum scroll bar then we do not show anything... If this strategy is perfect or not, I am not sure about. ;-)

All normal functions for scrolling (with mouse wheel, with navigation) are working.