Which browsers does eCO support?
“The eCO system is designed to work with Microsoft Internet Explorer 6.0 and Netscape Navigator 7.02. Firefox 2.0 users must adjust the Tabs setting to “New pages should be opened in: a new window.” The Tabs setting is under Tools/Options for Firefox for PCs and under Preferences for Firefox for Macs. The Safari and Google Chrome browser ARE NOT currently certified for use with the eCO system. Other browsers such as Opera and Konqueror may work with the eCO system.”
— U.S. Copyright Office, eCO Online System