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)