This is a quote from the support article mentioned below. Note:: If the Import Wizard does not list your other browser, you can still import bookmarks from that browser but you will need to first export and save the bookmarks as an HTML file. Visit the support site for your other browser if you need help with that. You can then import those bookmarks into Firefox from the HTML file.

https://support.mozilla.org/en-US/kb/import-data-another-browser

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