Just so that I can understand what you are trying to do .... you have an epub open in an ancient version of Sigil in BookBrowser and are trying to copy formatted text to the clipboard from it that you the paste into a web browser window someplace? You are not trying to paste into Sigil.
Is that correct?
If so I am not sure if this is even a Sigil issue at all. Once you copy the text, examine your system clipboard to see what mimetypes are supported by what you copied. If it includes rich text or html, then the issue is with the browser you are pasting into.
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