Lightning 1.9b2 about:memory warning

I am seeing this message when checking about:memory in Troubleshooting 
Information.

WARNING: the following values are negative or unreasonably large.
    explicit/storage/sqlite/(10 tiny)/other
This indicates a defect in one or more memory reporters.  The invalid 
values are highlighted.

The warning is caused by the last value in this tree.

────7.27 MB (03.95%) -- storage/sqlite
│    ├──5.12 MB (02.78%) -- local.sqlite
│    │  ├──3.21 MB (01.75%) ── cache-used [6]
│    │  └──1.91 MB (01.04%) ++ (2 tiny)
│    └──2.15 MB (01.17%) -- (11 tiny)
│       ├──1.35 MB (00.73%) ++ global-messages-db.sqlite
│       ├──0.64 MB (00.35%) ++ extensions.sqlite
│       ├──0.43 MB (00.23%) ++ places.sqlite
│       ├──0.36 MB (00.19%) ++ addons.sqlite
│       ├──0.26 MB (00.14%) ++ blist.sqlite
│       ├──0.20 MB (00.11%) ++ timezones.sqlite
│       ├──0.18 MB (00.10%) ++ signons.sqlite
│       ├──0.17 MB (00.09%) ++ cookies.sqlite
│       ├──0.10 MB (00.06%) ++ content-prefs.sqlite
│       ├──0.02 MB (00.01%) ++ permissions.sqlite
│       └──-1.55 MB (-0.84%) ── other [?!]

This is the only calendar related message in the Error Console.

Timestamp: 10/22/2012 08:47:43 AM
Warning: Use of Mutation Events is deprecated. Use MutationObserver instead.
Source File: chrome://calendar/content/widgets/calendar-widgets.xml
Line: 306

It is not there if I restart in safe mode. Enabling each extension one 
by one, shows it to be caused by Lightning 1.9b2.

-- 
Fedora 17 (64-bit)
KDE 4.9.2
Thunderbird Beta (17.0) Install and test it.
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