Quote:
Originally Posted by neonbible
Whats the easiest way to edit a mobi file to add chapter marks?
Please dont say convert it to epub in Calibre and edit with Sigil 
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Don't ask for the easiest if that isn't what you want

You could also extract the html from the mobi file, add header tags to it in the relevant places, then re-generate the mobi with mobicreator.