Delete Cookies and Other Web Browser Temp Files
Cookies and other temporary Internet files can eventually start to slow down Mac OS X, if they accumulate over a period of time. Thus, a recommended Mac computer maintenance step is to delete these files from your system and regain OS X and browser performance. Doing this is very simple.
Most likely, you are using Apple's Safari browser that came installed on your Mac. If so, start by launching Safari. Once Safari is opened, click Safari from the top Mac OS X toolbar and select Reset Safari... from the drop down menu. This should bring up the Reset Safari box. Select any or all items that you would like to clear from your Mac. Please note, once deleted these files are not easily recoverable. Make sure that you check only the items that you want to clear. For example, you may not want to clear saved names and passwords. Click the Reset Safari button. Upon doing so, the Safari browser will restart with your new settings.
If you are using the popular web browser Firefox, deleting cookies and other temporary Internet files is just as simple. To start, launch Firefox and make sure that it's active and open on your desktop. Once Firefox is ready to go, click Tools from the top Mac OS X toolbar and select Clear Recent History... from the drop down menu. This will bring up a screen where you can select which files you want to save/delete, and select the duration for time in which you want Firefox to delete these files. For example, you can choose only to delete files from within the last hour.