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Hello!
I also have problem in FF 32: scrollbar disappears.

Without other Add-ons.
When change scale site view (for example to 130%) scroll bar is hidden.

When I visited site - I see scroll bar:
http://iceimg.com/OUr-rMpU/ashampoo-snap-20140905-09h02m09s-002

When I scrolling (mouse wheel) scroll bar are hidden:
http://iceimg.com/lb8kSqWe/ashampoo-snap-20140905-09h02m37s-003

Thank you!

Questa recensione riguarda una versione precedente (3.0.5) del componente aggiuntivo. 

If you want to help me to solve this bug, see the support forum discussion that is begining : http://forums.mozillazine.org/viewtopic.php?p=13751999#p13751999