Hide useless Fiddler clutter that doesn't remember its visibility: Get Started and Fiddler Orchestra Beta tabs and Composer history pane

fiddler-declutter.js

/*
 * Features: Hide the Get Started tab, Fiddler Orchestra Beta tab, and Composer history pane, which don't remember their visibility across Fiddler restarts
 * Installation: Add these members to the Handlers class in %USERPROFILE%\Documents\Fiddler2\Scripts\CustomRules.js
 */
class Handlers {

    // If you already have an OnBoot() method, you'll want to combine it with this, or rename this and call it from yours.
    static function OnBoot() {
        var timer = new Timer();
        timer.add_Tick(OnLateBoot);
        timer.Interval = 25;
        timer.Enabled = true;
        
        Fiddler.FiddlerObject.UI.pageBuilder.add_ControlAdded(OnComposerLoaded);
    }
        
    static function OnLateBoot(sender: Object, eventArgs: EventArgs) {
        var controls = Fiddler.FiddlerObject.UI.tabsViews.Controls;
        if (controls.Count >= 10) {
            sender.Enabled = false;
            var controlsEnumerator = controls.GetEnumerator();
            var controlsToRemove = new Array();
            var controlsToRemoveLength = 0; // Array.Length is broken in Fiddler JScript and always returns undefined
            while (controlsEnumerator.MoveNext()) {
                var control: Control = controlsEnumerator.Current;
                if (control.Text == "Get Started" || control.Text == "Fiddler Orchestra Beta") { // TODO not localized, but the keys/names are empty so we have to match on user-facing text
                    controlsToRemove[controlsToRemoveLength++] = control;
                } 
            }
        
            for (var index = 0; index < controlsToRemoveLength; index++) {
                controls.Remove(controlsToRemove[index]);
            }
        }
    }
            
    static function OnComposerLoaded(sender: Object, args: ControlEventArgs) {
        ((SplitContainer) (sender.Controls[0].Controls[0].Controls[0].Controls[0])).Panel2Collapsed = true;
    }
    
}

Useful for debugging Forms control tree:

static function PrintChildHandles(parent: Control) {
    var index = 0;
    var children = parent.Controls.GetEnumerator();
    var message = "";
    while(children.MoveNext()){
        var child: Control = children.Current;
        message += index+": name="+child.Name+", text="+child.Text+", handle=0x"+child.Handle.ToString("X")+"\n";
        index++;
    }
    MessageBox.Show(message);
}