Bug#828159: firefox-esr: session tabs lost after upgrade from iceweasel to firefox-esr

[François Revol]

I also have had trouble for a while restoring session when quitting
properly, although killing Firefox instead usually seems to restore
correctly.

Trying to copy either the session.js or some .bak files as restore.js
usually works.


After cleaning up the 800 tabs in one window, I've quit it correctly,
but it consistently failed to restore one of the windows, with more than
1200 tabs (I know, it's a bad idea), openning it with just empty tabs.
The other windows restored fine though.

I ended up using python to split the tabs to several windows.
600 tabs per windows seemed fine at first, but there were still some
empty tabs. 300 seems to work fine.

Here is how I did it:

$ cd ~/.mozilla/firefox/*.default/sessionstore-backups
$ cp recovery.bak.001 recovery.js
$ python
> import json
>>> s=json.loads(open("recovery.js", "rb").read())
>>> for l in s['windows']:
...     len(l['tabs'])
...
44
1257
5
>>> s['windows'].append({})
>>> s['windows'].append({})
>>> s['windows'].append({})
>>> for k in s['windows'][1].keys():
...     s['windows'][3][k] = s['windows'][1][k]
...     s['windows'][4][k] = s['windows'][1][k]
...     s['windows'][5][k] = s['windows'][1][k]
...
>>> for l in s['windows']:
...     len(l['tabs'])
...
44
1257
5
1257
1257
1257
>>> t = s['windows'][1]['tabs']
>>> s['windows'][1]['tabs'] = t[0:300]
>>> s['windows'][3]['tabs'] = t[300:600]
>>> s['windows'][4]['tabs'] = t[600:900]
>>> s['windows'][5]['tabs'] = t[900:]
>>> for l in s['windows']:
...     len(l['tabs'])
...
44
300
5
300
300
357
>>> open("recovery.js", "wb").write(json.dumps(s))