How to change the disk cache location of Firefox

In the address bar of Firefox, go to about:cache, remember the Cache Directory under Disk cache device, it's the original default Cache Directory, you may wanna delete it after changing it to a new one.

In the address bar of Firefox, go to about:config, add a new string called browser.cache.disk.parent_directory, if the value of the string is R:\TEMP, the cache of Firefox will be stored in R:\TEMP\Cache

Restart Firefox for the changes to take effect.