404 Register A Firefox add-on that checks domain availability
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404 Register Description

When you run into "Server not found" error it usually means that the domain has not been registered jet. 404 Register is a Firefox extension designed to verify the domain availability and provide you with registration links of the most popular domain registrars on that error page. To test the addon just type some domain name into the address bar for which you are sure it is not registered.

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