You could try to write into CSV files, which can be opened via Excel.
Probably you won't be able to read/write XLS files since they have a 
proprietary format. If you want to read/write XLSX files, you could make a 
little search <https://www.google.de/search?q=javascript+xlsx>.
Anyway, your problem doesn't sound like it's related to Firebug. Firebug 
doesn't read/write Excel files. So if there's something specific you need 
to know about Firebug, then please describe your problem more precisely and 
post some code (or your extension).

Sebastian

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