Browsers try to enhance performance by keeping a copy of the web page content in memory. In theory, the next time you visit the same page, the content is already on your computer so it appears faster. The local copy of the web page is in what is called "cache"
The bad news is that when the web page changes on the server, you may still be using the "old" version. To fix this, you should clear the browser cache.
Safari
To learn more about clearing your cache in Safari, visit Apple Support.
In the Safari menu bar, click the Safarioption.
Select the Preferences link.
In the Preferences window, click the Advanced tab.
At the bottom of the window, select the Show Develop menu in menu bar checkbox.
Return to the Safari menu bar and click the Develop option.
Select the Empty Caches link.
Chrome
To learn more about clearing your cache in Chrome, visit Google Support.
On the browser toolbar, click the Chrome menu icon.
Select the More Tools link.
Select the Clear browsing data link.
Use the drop-down menu to select the time range you want to clear browsing data.
Clear browsing data by selecting checkboxes. Select the Cookies and other site and plug-in data and Cached images and filescheckboxes.
Click the Clear Browsing Data button.
Firefox
To learn more about clearing your cache in Firefox, visit Firefox Support.
In the Firefox menu bar, click the Firefox option.
Select the Preferences link.
Click the Privacy tab.
Under the History heading, click the clear your recent history link.
Select the Cache checkbox. You can select multiple checkboxes for other browser information to clear as well.
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