NS_ERROR_OUT_OF_MEMORY nsSessionStore.js line 2069

I set up a Fusionchart (http://fusioncharts.com) with a META refresh
every minute for a "stats" monitor on some servers.

Actually, several of the same chart for several servers...

Anyway, I came in this morning, and I've got this in all the browsers,
followed by a crash:

[Exception... "Component returned failure code: 0x8007000e
(NS_ERROR_OUT_OF_MEMORY)
[nsIScriptableUnicodeConverter.ConvertFromUnicode]" nsresult:
"0x8007000e (NS_ERROR_OUT_OF_MEMORY)" location: "JS frame ::
file:///C:/Program%20Files/Mozilla%20Firefox/components/nsSessionStore.js
:: sss_writeFile :: line 2069" data: no]
[Break on this error] converter.charset = "UTF-8";
nsSessionStore.js (line 2069)

Any suggestions on a way to avoid this?...

Month old machine, Win XP, downloaded/updated FF.

With 3 Gig of ram, that's a LOT of session data or something getting
stored...

I don't know JS well at all...

Should I add a line around 2079 to somehow free that 'converter'
object?

Sure looks like a memory leak to this naive reader...

What does "free" in JS look like anyway?

I'm not subscribed, afaik, and don't actually use GMail so please Cc:
me on replies:
ceo AT l-i-e DOT com

Thanks!