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I can only assume that reducing memory consumption by 400 percent meant 80%. You can't reduce more than 100% unless it's magical addition of RAM.

@Gnostradamus: That does sound weird, doesn't it. This explanation from Nethercote's post might help:
"Normally Fx would start at 170MB and by the end of the day that would often be creeping up to 800 or 900 MB. Today using latest nightly I again started at 170, but now at the end of the day I’m only at 230MB! That’s a 4x reduction in memory consumption."
- Katherine

noyesk, on 10 May 2012 - 06:52 PM, said:

No, it is not a 4X reduction. It is a reduction by approximately 3/4 (the reduction from 900MB used to 230MB used would be a 670MB reduction, or about 75% of the previous 900MB). From another perspective, it is the use of approx 1/4 of the memory previously used (230MB is approx 1/4 of 900MB). But it is not a 4X reduction, or a 400% reduction. As the previous poster pointed out, you can reduce a quantity by no more than 100%.

One final example: If I have a collection of rare coins then lose them all, I have lost 100% of the coins. Once I have lost 100% of them, there are no coins left to lose that could possibly create a 400% loss of the coins.

FWIW,
Bill

Good news - since one of my addons has major memory leakage and can cause FF to hit near 1 GB. at times. (this has been going on even after lots of FF and addon updates)