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When using a web proxy, should dns prefetch be disabled in Firefox ?

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When firefox is configured to use a web proxy, does it still make sense for firefox to perform DNS prefetching and page prefetching ?

Web proxies already perform prefetching by themselves and cache DNS.

When firefox is configured to use a web proxy, does it still make sense for firefox to perform DNS prefetching and page prefetching ? Web proxies already perform prefetching by themselves and cache DNS.