For reasons incomprehensible to me, Firefox is using non standard jsonlz4 file format to store bookmark backups.
You can forget about standard console based utilities to extract its contents as I have already tried this without any success.
It is a huge let down.

The solution is to use C decompress tool for mozilla lz4json format application by Andi Kleen.

Compilation process

Install required dependencies.

$ sudo apt-get install build-essential liblz4-dev

Clone git repository.

$ git clone

Change working directory.

$ cd lz4json

Compile application from source code.

lz4json$ make


Pass a compressed bookmark backup file as an argument to application, uncompressed data will be printed to stdout.

lz4json$ ./lz4jsoncat ~/.mozilla/firefox/profile.default/bookmarkbackups/bookmarks-2015-07-30_20.jsonlz4