I don't want my Firefox browser to store anything in a cache. Is there a way to shut the cache off?

about:config
set network.http.use-cache, browser.cache.disk.enable and browser.cache.memory.enable to false.
Or download the “Web Developer” Firefox plugin and disable cache via one.

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type about:config in the address bar

type cache in the filter box

double click browser.cache.disk.enable and it changes to false
double click browser.cache.memory.enable and it changes to false

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In addition to the above (which are correct too) the newer Firefoxes have built in "Private Browsing" or "Secure Browsing" session capability. This used to be an extension, but iirc it is built in now. It makes FF start in sort of a 'sandbox', and when you're done with it, it closes and leaves no cache, no cookies, no history, all those usual things, are not saved anywhere. Of course, this all assumes you want to leave no browsing trace; rather than maybe just using no extra disk/ram while browsing, for whatever reason (short on space/ram maybe?).

On my FF 3.6, I go to MENU --> TOOLS --> "Start Private Browsing" to do this.

Sasha

Well, I'm not short on memory, but when I back up my home folder, I don't want the cache backed up with it. Maybe there's a cp parameter that will leave those files out when I copy them to my backup HD, but I'd rather just not cache in the first place.

Uh...I should probably know this, but what is the "filter box"? I thought you might mean the "find" box that you use to search for a word, but it did not find the word "cache" when I tried it.

You can use rsync or grsync, it has an exclude option.
Or with tar yu can exclude directories also.

I've kept my cache but sym-linked it to a ram disk. That way I can turn off the computer and my cache is gone. It was never there. Unless the FBI is standing there with cryogenic kit to freeze my ram, anyway.