Why is Firefox 3.6 continually accessing the disk

Firefox is alwyas consuming a small amount of CPU on my machine. Using Process Monitor I can see it seems to be polling the temporary folder every half a second looking for a file with a TMP extension. Each time the name of the files is different the numeric part incrementing by one, for example the last time i looked it was checking for files A9r4567.tmp, then A9r4568.tmp so on. On top of this every ten seconds or so it will write out a the sessionstore file again. this is all without me doing anything in FireFox at all just simply having the app running, without the window in the foreground.
I'm assuming the sessionstore is simply keeping it up to date as a backup and maybe there is a setting for get it to do that less frequently, seems odd that it needs to do it when I have not browsed to a new page or anything else. Possibly some page is refreshing some content via AJAX and maybe thats triggering who knows. But why is it continually scanning the temp folder for these incrementaly named files, none of which exist (thats clear from looking in the folder and the fact in process monitor the response to that call is "NO SUCH FILE".

Ok I found out a bit more from a little more digging. I managed to trace the calls back through to nppdf32.dll which i believe is the adobe acrobat PDF reader plugin. So next question obviosuly is what on earth is that doing, which I guess is not a mozille firefox issue but an adobe one.

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