I'll try to explain this more coherently -

documents and settings/owner/local settings/application data/mozilla/firefox/profiles/profile-name_default/cache

Firefox 4 has a new caching system

cache - open up and say hello to multiple folders and subfolders, instead of single cache folder filled with cached files

This is making it an utter nightmare to try and copy/save streamed media, flash videos, unsaved pictures, other documents, etc

Many files in the hidden cache are not stored in "Temp" folder or "Temporary Internet Files" folder, the hidden cache is the only location where they're stored

How can users revert back the old cache (single folder) system?

See if this addon makes it easy for you- https://addons.mozilla.org/en-US/firefox/addon/cacheviewer/versions/

Thanks buddy but it's not compatible with Firefox 4 or 4.0.1.

O ye who issued Mozzila parties, you should not make people hate on you productand switch to another product, so please fix, so the cache can be enjoyed with ease by arixx