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How to clear the browser cache in Firefox

Your internet cache stores a copy of each web page you visit on your PC's hard drive, in order to speed up page loading times on sites you revisit within a day or two. This feature serves its intended purpose, but can cause problems during the design-proofing process, with clients still seeing the previous version of their site despite a new version being live. Sometimes just pressing your browser's 'Refresh' button can clear this problem.

If the browser refresh doesn't work then you will need to manually clear these files.

We suggest that each time you are asked to review a change made to your web site, you clear your internet cache beforehand, to avoid confusion.

1. First navigate away from any page suspected to be cached.

2. Click the Menu button (aka the "hamburger button" - the one with three horizontal lines in the top right hand corner of the browser window) and then choose Options.

If Options is not listed in the menu, click Customize at the bottom of teh menu and drag Options from the list of Additional Tools and Features over to the Menu. ​

Note: If you are using the menu bar, choose Tools and then Options instead. You can also enter about:preferences in the address bar of a new tab or window.​

Firefox for Mac: On a Mac Options is called Preferences, choose Preferences from the Menu button and then continue as instructed below.

3. Once the Options (Preferences on Mac) window is open, click the Privacy tab on the left.

4. In the History area, click the clear your recent history link.

Tip: If you don't see that link, change the Firefox will: option to Remember history. You can change it back to your custom setting when you're done.

5. In the Clear Recent History window that appears, set the Time range to clear: to Everything.

6. In the list at the bottom of the window, uncheck everything except for Cache.​

Note: If you wish to clear other kinds of stored data, feel free to check the appropriate boxes. They will be cleared along with the cache in the next step.​

Tip: Don't see anything to check? Then click the down arrow next to Details. The list of checkable options will appear.

7. Click on the Clear Now button.

5. When the Clear Recent History window closes, all of the cached files (saved files) from your browsing activities in Firefox will have been deleted.

Note: If your internet cache is large, Firefox may hang while it finishes removing the files. Please be patient - it will eventually finish the job.


If the above steps do not fix the problem, it is possible that the files are being cached by a web server in-between your computer and our server. Please call the webteam on 01253 608013 to discuss further steps we can take to temporarily work around the problem.