I have a bilingual site with two versions Arabic and English. In Arabic version on <body> I have applied style="direction:rtl" . This is causing an issue to a horizontal scrollbar. When I resize the screen to minimum resolution or zoom-out the screen the scrollbar not appearing seems like overflow-x: hidden property is set to it. I tried to overflow: scroll but it's not working. Anyone can please help.
This is a bug in Firefox, if you try it in Chrome it works.
You've just met Bug 992384, probably (another) regression of Bug 192767.
They're working on it, stay tuned ;)