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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 currently offers only one "tool" for resolving the problem, : the "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.
