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Transform text for vertical reading (right-to-left or left-to-right)
Toggle vertical mode on/off via popup or context menu
Customize font family, font size, line height, background color, and text color
Persistent storage of user preferences
Apply vertical mode to multiple text elements (paragraphs, headings, spans, divs)
Add vertical scrollbar when in vertical mode
Real-time updates when changing settings
Options page for easy customization

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