I'd even go as far as limiting it to 16kb.
(possibly with a transition phase during which going above 16kb only
prints warnings)

On 5/10/13 12:47 AM, Robert Kaiser wrote:
> FWIW, we had a pretty high-ranking topcrash in
> https://bugzilla.mozilla.org/show_bug.cgi?id=836263 where an add-on
> stored strings up to at least 128MB in prefs, and Nightly now limits
> prefs to 1MB max, and that add-on switched to indexedDB instead. This
> should happen more, for sure. I'd think that anything larger than a few
> KB probably doesn't belong in a pref.
> We couldn't easily set that limit mentioned above as low as we'd like
> because up to now we had no limit at all and some add-ons definitely
> store large stuff in prefs. Given that we probably read prefs in startup
> and before we can do anything useful with the launched Firefox, I wonder
> how much of a perf problem those large prefs tend to be, actually.
> 
> Robert Kaiser
> _______________________________________________
> dev-platform mailing list
> dev-platform@lists.mozilla.org
> https://lists.mozilla.org/listinfo/dev-platform


-- 
David Rajchenbach-Teller, PhD
 Performance Team, Mozilla
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