Bug 356831 added a release assert that when performing WPAD the network.proxy.type pref is always 4 (PROXYCONFIG_WPAD).
However, when changing the pref, the runnable is scheduled to run before the PAC thread is shutdown, so it will see the pref that is not PROXYCONFIG_WPAD, while attempting to do WPAD. To avoid this situation, we simply exit early when we detect the wrong pref value.
Differential Revision: https://phabricator.services.mozilla.com/D7617
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extra : moz-landing-system : lando