Examine source code of Table2CSV Magic

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  "manifest_version": 2,
  "name": "Table to CSV",
  "description": "Save HTML Tables, CSS Pseudo/DIV Tables or Lists (UL/OL) as a comma seperated values (CSV) file which can be opened with any spreadsheet processor (e.g. excel, libreoffice-calc,gnumeric) for further processing and conversion (e.g. to xls or ods)",
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