reply to Old Computer
Re: [FireFox] Can't move cache folder to other location ? Confirmed: I had some bad configuration.
Finally I made a fresh install of Firefox with a different profile, add only the "browser.cache.disk.parent_directory=R:\FirefoxCache" in about:config , and it worked like SeaMonkey.
Sorry for that, It was my mistake.
In the way I changed also the Cache directory for Google Chrome Browser, pointing also to my RamDisk.
Everything is fine now.