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=== Multi-process and IPC ===
[[File:WebNavigationE10S.png|left|thumb|500px|<xul:remote-browser>, frameloader and docshell in multiprocess configuration. The horizontal dash-lines represent inter-process communication]]
In a multi-process desktop Firefox, a tab is managed by <code>[https://dxr.mozilla.org/mozilla-central/source/toolkit/content/widgets/remote-browser.xml <xul:remote-browser>]</code>. It still operates on nsIWebNavigation, but in this case the docshell is in a remote process and can not be accessed directly. The encapsulation of remote nsIWebNavigation is done by the javascript-implemented <code>[https://dxr.mozilla.org/mozilla-central/source/toolkit/components/remotebrowserutils/RemoteWebNavigation.js RemoteWebNavigation]</code>.
