Can you give me the URL to your site?
Meanwhile, open the public_html folder and check that your files are actually present.
If not, drag and drop them to the opened public_html folder window.
index.htm should be the only *file* that shows, all other files should be in the folder "index.htm_files"
(PS: index.htm is not specifically a Firefox doc, your PC simple associates the .htm file extension with Firefox as the application which will open it.)
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