Here's one that @h_classen created:
It is dead simple, no code required - but it had an issue with Safari - scrollbars would not show.
I have made some minor tweaks to Hans' original file:
• Unchecked "Use Webkit graphics acceleration" in the "Document Inspector" (scrollbars now show)
• Set the "Content Overflow" to "Auto Scrollbars" (cosmetic change)
Adjusted version here: TB_JHSv1.zip (63.7 KB)