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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!

Это отзыв для предыдущей версии этого дополнения (3.0.5). 

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