It depends on the extension, what are you using? Search in the Add-on store[0] If It's present there, then Firefox can even import them from Chrome for you if it matches certain criteria[1]

[0] https://addons.mozilla.org/en-GB/firefox/

[1] https://support.mozilla.org/en-US/kb/import-bookmarks-google...

It's generally pretty easy since FF uses the same WebExtension API.