gistfile1.txt

#!/bin/bash

# https://unix.stackexchange.com/questions/385023/firefox-reading-out-urls-of-opened-tabs-from-the-command-line 

if [[ $1 == *jsonlz4 ]]; then
    export opentabs="$1"
elif pgrep -f waterfox &>/dev/null; then
    export opentabs=$(ls -t ~/.waterfox/*/sessionstore-backups/recovery.jsonlz4 | sed q)
else
    export opentabs=$(ls -t ~/.mozilla/firefox*/*/sessionstore-backups/recovery.jsonlz4 | sed q);
fi

python3 <<'EOF'
import os, sys, json, lz4.block
f = open(os.environ["opentabs"], "rb")
magic = f.read(8)
c=0
jdata = json.loads(lz4.block.decompress(f.read()).decode("utf-8"))
f.close()
for win in jdata.get("windows"):
    print("")
    for tab in win.get("tabs"):
        i = tab.get("index") - 1
        urls = tab.get("entries")[i].get("url")
        print(urls)
EOF