Ramback 1.0 doesn't seem to have a noticeble difference Rated 2 out of 5 stars

I have to keep clicking on Tools/Clear Caches when my own hard drive finally light stops. The hard drive light flashes some more then i have to keep doing this, which doesn't seem to have a noticeble difference. What I find more effective is closing down Firefox and starting again. Try not to have too many memory/processor hungry tabs running like Yahoo Mail and Planefinder.net.

I have been using it on FF18 and 17, 16 i think
Window XP SP3
half gig RAM
Pentium 4 2.8 Ghz

Add-ons page says last updated 20 December 2012 but its the same version 1.0 I've been using for the past few months, why?