Firefox: Reduce Cache Size or Disable It

Firefox

Want to reduce Firefox’s cache size or completely disable it? You can do just that by changing these two items in its behind the scenes settings.

Reduce Browser Cache Memory Capacitity

  1. In the URL address bar in Firefox, where you would enter the website you want to visit, enter “about: config” — without the quotes.
  2.  Use CTRL-F to search for “browser.cache.memory.capacity“.
  3.  Enter the number you want to use for the memory cache in KB. If you’re unfamiliar with kilobytes, 1024 KB is 1 MB.

Reduce Browser Cache Disk Capacity

  1. In the URL address bar in Firefox, where you would enter the website you want to visit, enter “about: config” — without the quotes.
  2.  Use CTRL-F to search for “browser.cache.disk.capacity“.
  3.  Enter the number you want Firefox to use on your disk for its browser cache, also in in KB.

You can also make basic changes to the Firefox cache usage by going to Options -> Advanced -> Network under the Cached Web Content sub-heading and override its automatic cache management.

If you want to Completely Disable Cache

This can be done by changing the values for each of the entries indicated above to 0. This will let Firefox know you don’t want to cache anything at all in the memory or the disk. This is especially great for portable usage of Firefox where you have limited space available to run it.

If you’re looking to make Firefox even better, see our tips on how to have Firefox reduce memory usage