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=Introduction=
When Firefox cannot display a requested web page because of a network error, it shows a network error page. This page describes the problem, but it offers only one “tool” "tool" for resolving the problem, the ‘’’Try Again’’’ "Try Again" button. This is of limited utility, in fact, for a large class of errors, this is the one thing guaranteed not to work (cf. misspelled URLs). A better network error page would provide a variety of tools for resolving the problem.
Additionally, web pages that result in 404 errors have a lot in common with network error pages, except that the error page is provided by the server. In many case this is a default 404 error page for the server which is not very helpful. The other major browsers will substitute a browser-provided 404 error page in many cases (the typical rule seems to be not to override server-provided error pages over about 500 bytes in length, since those are likely to be customized). Firefox should provide similar functionality.