Bug 286949 [Browser] Bad usage of URL#equals(Object) in WebBrowserEditorInput
HEAD WebBrowserEditorInput#equals(..) calls URL#equals(Object), but the latter resolves the host of the URLs via DNS lookups, which is most of the time not what you want. You should instead compare the strings from URL#toExternalForm(). Furthermore, WebBrowserEditorInput should also override hashCode() (equal objects must have equal hash codes). Note that URL#hashCode() is also broken, so you should use URL#toExternalForm() there as well.
bundles/org.eclipse.ui.browser/src/org/eclipse/ui/internal/browser/WebBrowserEditorInput.java
return id;
	}
	/**
	 * Returns true if the status bar should be shown.
	 * 
	 * @return boolean
	 */
	public boolean isStatusbarVisible() {
		return (style & IWorkbenchBrowserSupport.STATUS) != 0;
	}
	/**
	 * Returns true if the toolbar should be shown.
	 * 
	 * @return boolean
	 */
	public boolean isLocationBarLocal() {
		return (style & BrowserViewer.LOCATION_BAR) != 0;
	}
	/*
	 * public boolean isLocationBarGlobal() { return (style &
	 * ExternalBrowserInstance.LOCATION_TOOLBAR) != 0; }
	 */
	public boolean isToolbarLocal() {
		return (style & BrowserViewer.BUTTON_BAR) != 0;
	}
	/*
	 * public boolean isToolbarGlobal() { return (style &
	 * ExternalBrowserInstance.BUTTON_TOOLBAR) != 0; }
	 */
	/**