Re: Cache Mystery
Don't worry about it - Mozilla based browsers have the capability to prefetch data accessed through links to on certain web pages and store them in the cache for faster browsing. This only happens if the connection is inactive at the time, removing any performance negatives.
This is exploited by a command on a website. Google, among a few others, use the feature to load their search results faster when they are clicked on. I think Google Images use the feature also, but I'm not sure.
The Firefox Extension "FasterFox" also uses the prefetching mechanism to load pages the user may visit in the future before they actually go to them.
You can disable link pre-fetching if you want through the hidden advanced preferences option. This is a good idea if you are browsing using a Mozilla based browser at work - although pre-fetched sites don't appear in your history, they do appear on company firewall records.
Type "about:config" into the Location Bar. Ignore any warnings which appear. You should see a load of weird registry entry like commands. Search for "prefetch".
Double click on the entry "network.prefetch-next" which appears. The value should then change to false, disabling prefetching.
You can find more details on link pre-fetching here.
Hope this is useful
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