Editing the Master Style is generally a bad idea. From what I've seen, if vB updates templates in an upgrade, they are written to the Master Style, so if your edited template is one of the affected ones, your changes will disappear (instead of you being prompted to update your templates). I'm sure there's a good reason it only appears when debug mode is enabled.
Personally, I would only use the Master Style for developing modifications that use their own templates. But I'm not sure if that's a good idea in and of itself.
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