Hey there!

Are you're wanting to export your current Firefox bookmarks on your mac to your windows 10?

So what browser are you using on your Windows 10?

For Internet Explorer : https://support.mozilla.org/en-US/kb/export-bookmarks-internet-explorer

For Opera : https://support.mozilla.org/en-US/kb/export-bookmarks-to-opera

If you're want to import your bookmarks from your Windows 10 firefox bookmarks to your Mac :

For Internet Explorer or Microsoft Edge : https://support.mozilla.org/en-US/kb/import-bookmarks-internet-explorer-or-microsoft-edge

For Google Chrome: https://support.mozilla.org/en-US/kb/import-bookmarks-google-chrome

Hope I helped!

Kind regards,

Bithiah

Different computer systems may not be compatible as to copying files. You would be better off using sync.

https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer Sync your bookmarks, history, passwords, add-ons and open tabs with another copy of Firefox. Learn how to set up Sync.

https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefox We'll show you how to choose which types of information (bookmarks, history, add-ons, and passwords) to share across all your devices through Firefox Sync.

https://support.mozilla.org/en-US/kb/firefox-sync-troubleshooting-and-tips

https://support.mozilla.org/en-US/kb/sync-firefox-bookmarks-and-browsing-history-iOS Sync your passwords, history, tabs and other browsing information across your iOS, Android and desktop computers with Firefox Accounts.

Yes, what FredMcD said is very important and syncing can be much easier and quicker.

Hello, unfortunately that doesn't solve my problem at the moment! I need the Firefox bookmarks from an iMac with defective graphics so that Firefox can no longer be started! However, I was able to copy the Firefox folder from the iMac's hard drive to my Windows 10 laptop. Now I am looking for the corresponding file to import into Firefox on the Windows 10 laptop!

Thanks for support

Good luck.