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The Skins Frames Icons Debuffs tab allows for various debuff icon settings.
To restrict fonts to only those that might be used, install the HealBot Media plugin.
The Skins Frames Icons Debuffs General tab allows for various icon settings, including the position of the icons, scale of the icons and independent opacity to the bar.
The Skins Frames Icons Debuffs Text tab allows for customising the text displayed on icons, this is generally duration and stacks.