refer faQ

• Select Tools > Internet Options from the menu bar.
• Click <Delete Files> to delete the cached files.

You can also manage the disk space for the cached files and the location by the following steps:

• Click Settings in the Temporary Internet Files region.
• This displays the current location of the Temporary Internet files folder. You can change the location of the folder, increase or reduce the disk space for the cache files or delete the contents in that folder.

Firefox (Version 1.5)

• Select Tools > Options from the menu.
• Click 'Privacy' tab.
• Click 'Cache'
• Click the <Clear> button to clear the cache entries.