站上的搜尋功能好像有問題...

你可以照底下的做


出處：http://texturizer.net/firefox/tips.html#oth_cache

Specify where to store the cache

To specify in which folder the cache is stored, add the following code to your user.js file:

// Path to Cache folder:
user_pref("browser.cache.disk.parent_directory","C:\\Path To Cache");

Remember to use two backslashes for the path separators if you're using Windows, e.g. C:\\Path\\Path To Cache instead of C:\Path\Path To Cache.

或是在 about:config 裡面新增一個字串值也是可以。