Can the DNS cached entry in Firefox be updated and changed?

I have a specific testing requirement to meet.

One of the requirements is to redirect a non-existent URL to a specific IP address, which is what the DNS is currently handling. I suspect that Firefox is using an internal DNS cache. However, I'm having trouble finding a suitable service to modify this type of DNS cache. Additionally, I am unsure if Firefox supports any services to customize the DNS process and provide a customized result instead of retrieving information from the DNS server.

Since I need to run multiple Firefox processes concurrently for my work, simply changing the system hosts file is not a viable option as it may affect other processes.

Does anyone have any ideas or suggestions?

javascriptfirefox-addondnsxpcom

Answer №1

Unfortunately, Firefox does not allow for the modification of DNS responses directly. The DNS service in Firefox simply triggers a DNS request, but there is a workaround that involves recognizing the NS_ERROR_UNKNOWN_HOST response and redirecting it to another server. While recognizing this response isn't too difficult, the redirection process can be quite complex. One potential solution is to implement a progress listener and monitor the completion of requests in the onStateChange method using the parameter aStatus. By looking for the status 

Components.results.NS_ERROR_UNKNOWN_HOST
, you can then change the window location for top-level requests (aFlag & STATE_WINDOW) to make a request to a different server. However, for other types of requests, redirecting may pose a challenge.

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