Safari:
- Click on the Safari menu in the top left-hand corner
- Click on Settings...
- A new dialogue box will open
- Click Privacy
- Click on the Manage Website Data button
- To remove any cached data and cookies from your computer, click Remove all
- A new dialogue box will open
- Click Remove Now
- Wait a few moments, then click Done
- Close the dialogue box remaining
- Press Command +Q to quit Safari
Firefox:
- In the Menu bar at the top of the screen, click Firefox and select Settings (or Preferences, in some cases).
- Select Privacy & Security on the left and go to the Cookies and Site Data section.
- Click Clear browsing data. The Clear browsing data and cookies dialog will appear.
- Set When: to Everything or a shorter time period, such as the last hour.
- Ensure Cookies and site data and Temporary cached files and pages are checked.
- Click Clear.