Checkout this video:
2.Click on the Safari menu.
3.Click on Preferences.
4.Click on the Security tab.
6.Close the Preferences window.
Open Preferences from the Chrome menu.
Click Advanced at the bottom.
In the “Privacy and security” section, click Content settings.
Turn on Allowed (recommended).
1. In the top-left corner of the Firefox window, click the menu button.
2. Select Preferences.
3. In the left column, choose Content.
5. Close the about:preferences page to save your changes and restart Firefox for the changes to take effect.