Review for Password Exporter by Todd Olinger
Rated 1 out of 5 stars
I just copied these files from my old firefox profile folder to my new firefox profile folder
signons.txt (all files - sometimes there are numbered versions)
key3.db
That brought over all of my passwords and I didn't have to trust a software plugin not to do anything nefarious with my passwords while it was exporting them.
Hope this helps!
To create your own collections, you must have a Mozilla Add-ons account.