Clearing the cache removes old data so you can see the latest updates to content or settings. After you clear the cache, you might need to re-enter stored passwords or other saved items.

1. Open Firefox, click the menu button in the upper-right corner, then select Settings.
   
2. From the menu on the left, select Privacy & Security.
   
3. Go to Cookies and Site Data, then click Clear Data.
   
4. Make sure both checkboxes are selected, then click Clear. Close the browser.
   

Clearing the cache might take a few minutes, depending on the time range you selected. After that, your cache is clear and any updates to content or settings are refreshed.