Chrome
Importing & exporting bookmarks in Chrome:
https://support.google.com/chrome/answer/96816?hl=en
Export bookmarks in Firefox:
https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
Import bookmarks in Firefox:
https://support.mozilla.org/en-US/kb/import-bookmarks-html-file
https://support.google.com/chrome/answer/96816?hl=en
https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
Import bookmarks in Firefox:
https://support.mozilla.org/en-US/kb/import-bookmarks-html-file