How to - Delete, empty or clear the cache - Firefox

Firefox: How to Clear Your Browser Cache (2026 Guide)

In the high-speed world of 2026, even a modern browser like Firefox can occasionally get "clogged" with old data. Clearing your cache (or Cached Web Content) is the go-to fix when a simulator on Chasms.com won't load, or when a website shows you an outdated version of a page. This process removes temporary images and scripts without touching your saved passwords or bookmarks.

Here is the most up-to-date way to clear your cache in Firefox 148:

The "Power User" Shortcut (Windows & Mac)

This is the fastest method to reach the cleanup menu directly:

• Windows: Press Ctrl + Shift + Delete.

• Mac: Press Command + Shift + Delete.

Method 1: Using the Settings Menu

1. Click the Menu button (three horizontal lines) in the top-right corner.

2. Select Settings.

3. On the left-hand sidebar, click Privacy & Security.

4. Scroll down to the Cookies and Site Data section.

5. Click the Clear Data... button.

6. Crucial Step: Uncheck "Cookies and Site Data" if you want to stay logged into your websites. Ensure "Cached Web Content" is checked.

7. Click Clear.

Method 2: The "Everything" Reset (Via History)

If you want to be absolutely sure the cache is empty:

1. Click the Menu button > History > Clear Recent History....

2. In the "Time range to clear" dropdown, select Everything.

3. Under the "History" list, check the box for Cache.

4. Click Clear Now.