How do I clear the browser cache and cookies?

Clear Cache and Cookies on Windows
Internet Explorer 8

Open Internet Explorer.
Click on "Tools" located on top right hand corner of your Browser (You can also hold the ALT key on your keyboard and press the letter T).
Click on the first link "Delete Browsing History".
Select "Temporary Internet Files".
Click on "Delete".
Click "OK" on the "Delete Files" dialog box.
Click "OK".
Restart the browser for the changes to go into effect. (Close and reopen).

Internet Explorer 9 & 10

Open Internet Explorer
Click the gear icon at the top right to open the "Settings" menu.
Select "Safety and Delete Browsing History"
Select "Temporary Internet Files". To also delete cookies, select "Cookies".
Uncheck "Preserve Favorites website data".
Click on "Delete".
Restart the browser for the changes to go into effect. (Close and reopen).

Firefox 3.5

Open Firefox.
Click "Tools".
Click on "Clear Recent History".
Beside "Time range to clear", click "Everything".
Click on "Details" and select only "Cache and Cookies".
Click "Clear Now".
Restart the browser for the changes to go into effect. (Close and reopen).

Firefox 18+

Open Firefox.
Click the Firefox menu in the top left corner.
Select "History" > "Clear Recent History".
Make sure "Details" is expanded, then select "Cache". To also delete cookies, select "Cookies".
For "Time Range to Clear", select "Everything".
Click "Clear Now".
Restart the browser for the changes to go into effect. (Close and reopen).

Chrome

Open Chrome.
Click the menu icon in the upper right corner.
Click "Settings".
Click "Show advanced settings" located at the very bottom of the settings section.
Scroll to the privacy section and click "Clear browsing data"
Select "Empty the cache". To also delete cookies, select "Delete cookies".
Click "Clear browsing data"
Restart the browser for the changes to go into effect. (Close and reopen).

Clearing Cache and Cookies on Mac
Safari

Open Safari.
Click on the Safari menu.
Click "Empty Cache".
Click "Empty" when asked "Are you sure you want to empty the cache?".
Restart the browser for the changes to go into effect. (Close and reopen).

Mozilla Firefox 3.5+

Open Firefox.
Click on "Tools" and then "Clear Recent History".
Set "Time range to clear" to "Everything".
Click on "Details" then check "Cache". To also delete cookies, check "Cookies".
Click "Clear Now".
Restart the browser for the changes to go into effect. (Close and reopen).

Chrome

Open Chrome.
Click on "Chrome" and then "Clear Browsing Data".
Set "Clear data from this period" to "Everything".
Select "Empty the cache". To also delete cookies, select "Delete cookies".
Click "Clear browsing data".
Restart the browser for the changes to go into effect. (Close and reopen).