how do i export firefox bookmarks toolbar to a file?
I want to migrate the firefox bookmark toolbar from my old computer to a new computer.
You can backup the bookmarks to a file, then copy that file to the new computer and import them, for details see Restore bookmarks from backup or move them to another computer.
You can copy more than just the bookmarks. The user data, such as bookmarks and passwords, are stored in the profile folder. You can copy the data manually by copying the contents of the profile folder, for details see Profile backup - MozillaZine Knowledge Base or Back up and restore information in Firefox profiles.