There were at least 7 bugs filed about this behaviour (see bug 1535581 and dupes). Junior, should we consider adding some text underneath the box that says something to the effect of "localhost never uses the proxy"?
Bug 1507110 Comment 24 Edit History
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There were at least 7 bugs filed about this behaviour (see bug 1535581 and dupes) since it hit release. That's quite a lot. Junior, should we consider adding some text underneath the box that says something to the effect of "localhost never uses the proxy"?