Just tested with firefox 61.0.1 on 18.04.1 and it works again, thanks.
** Changed in: firefox (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1602370
Title:
** Tags added: xenial
** Description changed:
You have different firefox profiles.
You want to copy the bookmark folder 'foo' including some bookmarks into
another profile.
The folder gets copied, but without content.
This is since a long time, maybe version 40 or so, I was hoping it
