Your browser saves or "caches" pages that you access frequently. This means it displays the saved version of a page on your computer, and may not upload the updated version of a particular page each time you access it. This allows for quicker download time. To ensure that the updated versions of pages are loaded, you may wish to clear your cache periodically by following these steps:
In Internet Explorer, select the Tools menu, then choose Internet Options. In the General tab under Browsing history, you can choose Settings and verify that your browser automatically checks for new file versions by selecting Automatically. Or to manually remove all temporary internet files and cookies, click Delete under Browsing history.
In Firefox, select the Tools menu and select Clear recent history from the drop-down list. From here, select Details and check the box next to Cache. You can also select the Time range to clear.