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About this Add-on
This whois extension opens the whois page in a tabbed pane in the background.
If it does not for your configuration, please provide me with details (firefox version, OS, whois version).
"Not valid install package":
All new packages are likely to produce download errors up to 30min after approval. In this case you can download it from http://www.uberdose.com/firefox/whois.html.