ZyXEL Communications NSA-220 Plus User Manual page 299

In the Certificate Manager dialog box, click Web Sites > Import.
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Figure 146
Use the Select File dialog box to locate the certificate and then click Open.
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Figure 147
The next time you visit the web site, click the padlock in the address bar to open
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the Page Info > Security window to see the web page's security information.
NSA-2401 User's Guide
Firefox 2: Certificate Manager
Firefox 2: Select File
Appendix D Importing Certificates
299