Your Internet browser's cache stores certain information, such as snapshots of web pages you visit, so you do not need to download the same information multiple times.
This lets images load more quickly on future visits and while you are on websites that use the same images on multiple pages.
Occasionally, however, your cache can prevent you from seeing updated content or cause functional problems when stored content conflicts with live content.
You can fix many browser problems simply by clearing your cache.
Firefox:1) Click the menu button and choose “Options.”
4) Click “Clear Now” in the “Cached Web Content” section.
5) Click OK to close the “Options” window.
2) Select “Tools.”
3) Select “Clear browsing data.”
4) In the dialog that appears, select the checkboxes for the types of information you want to remove.
5) Use the menu at the top to select the amount of data you want to delete. Choose “beginning of time” to delete everything.
6) Click "Clear browsing data.”
The Temporary Internet Files (or cache) folder is used by Windows Internet Explorer and by MSN Explorer to store webpage content on the computer hard disk for quick viewing. To delete the files in the Temporary Internet Files folder yourself, follow the steps for your version of Windows.
Windows 7 and Windows Vista1) Click Start, click Control Panel, click Network and Internet, and then click Internet Options.
2) Click the General tab, and then click Delete under Browsing history.
3) Click Delete all, click Yes to confirm that you want to delete this information, and then click OK.
Earlier versions of Windows1) Exit Internet Explorer.
2) Exit any instances of Windows Explorer.
3) Click Start, click Control Panel, and then double-click Internet Options.
4) On the General tab, click Delete Files under Temporary Internet Files.
5) In the Delete Files dialog box, click to select the Delete all offline content check box.
6) Click OK two times.
Step One: Enable menu bar
Open settings, Launch Safari, click Safari in the upper-left corner of the main menu bar, and select the Preferences option near the top of the drop-down menu. Afterwards, click the Advanced tab located in the top navigation bar and check the box directly to the left of the “Show Develop menu in menu bar” option to add the menu to Safari by default.
Step Two: Clear the browser cache
Click the Develop menu near the middle of the main Safari menu bar and select the Empty Caches option.
See also these online resources: