Pretty-print the last Firefox session's windows, tabs, and URLs. Useful for when Firefox fails to correctly reload a tab on start, and you have no idea what was loaded in that tab, but you know it was important.

print-firefox-session.py

#!/usr/bin/env python

import datetime, json, sys

def formatEntry(entry):
    return "%s (%s) (%s)" % (entry['title'].encode('utf8')
                                 if entry.has_key('title') else "<untitled>",
                             entry['url'].encode('utf8'),
                             datetime.datetime.fromtimestamp(
                                   int(tab['lastAccessed']) / 1000).strftime('%Y-%m-%d %H:%M:%S'))

j = json.load(sys.stdin)

for i, window in enumerate(j['windows']):
        print "Window", i
        for tab in window['tabs']:
            print formatEntry(tab['entries'][-1])
            for e in tab['entries']:
                print "    %s" % formatEntry(e)
        print

print-last-firefox-session.sh

#!/bin/bash

# Sometimes when Firefox starts up, it displays empty tabs instead of
# the tab that was loaded in that slot.  And then when you try to
# reload it, it loads "New Tab", and the tab's history is gone.

# This is extremely annoying. If you're lucky, you can use the page
# title to find the page in your browsing history. If you're not, you
# may have no idea what page was loaded in that tab, and it may be
# effectively lost for good.

# However, Firefox does store the previous session's list of windows
# and tabs in a JSON file. However, this is a giant string with no
# line breaks and lots of extraneous data. Even pretty-printing it
# doesn't help a human find what he actually needs: the list of tabs
# and URLs loaded in the previous session.

# These scripts solve that problem.

# print-last-firefox-session.sh finds the appropriate files in the
# Firefox profile directories and sends the most recent one to
# print-firefox-session.py.

# print-firefox-session.py prints a list of windows, tabs, and the
# history of each tab, along with tab titles and last-accessed
# date/times.

# Last tested with Firefox 40.0.3. Should work with most previous
# versions, since it will still find "sessionstore.js" files. I don't
# think the format has changed much.

file=$(find $HOME/.mozilla/firefox -type f -iname sessionstore.js -o -iname previous.js -o -iname recovery.js -exec ls -t '{}' \; | head -n1)

if ! [[ -f $file ]]
then
    echo "$file not found"
    exit 1
fi

pp-firefox-session-urls.py <$file