How much cache-space will browsers use?

I'm curious how many MB/GB the various browsers will cache 开发者_运维知识库before prematurely deleting older cache files. Do you know? For bonus points, in which order will the cached files be deleted (beyond the ones which have expired).

---

It depends entirely on what the browser's preferences are set to.

Example (Firefox 4):

Example (IE 8):

Bonus points time

Typical cache expiration algorithms are

• LFU (least frequently used) and
• LRU (least recently used)