I have bookmarks on my kindle fire that I want to export to transfer...How can I?
Check https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer for a description how to export it to a HTML and/or or a importable file.
The best way to keep bookmarks in sync between different FireFox installations is Mozilla Sync. Give it a try! It's great and doesn't reveal your data to a third party (even Mozilla).
The linked document does not apply to Firefox for Android.
The only simple way to transfer bookmarks would be to use Firefox Sync. https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync