Select by color

I found this code that works in Flash CS6, but not in Animate 2021-22

var dom = fl.getDocumentDOM();
var timeline = dom.getTimeline();

/*
 MODIFY THE KEYS IN THIS TABLE.
 */
var coloursToDelete = {
    'FF0000': true,
    'FFFF00': true,
};

var replacements;
var srcColour;
var layerName;

// Make sure all colours are lowercase and start with a #
for(var colour in coloursToDelete)
{
    var val = coloursToDelete[colour];
    delete coloursToDelete[colour];
    
    if(colour[0] !== '#')
        colour = '#' + colour;
    
    coloursToDelete[colour.toLowerCase()] = val;
}

// Make sure to clear the selection, or the script will crash?
dom.selectNone();

fl.outputPanel.clear();

var deleteCount = 0;

// ----------------------------------------------------
// Loop through all layers
for(var layerIndex in timeline.layers)
{
    var layer = timeline.layers[layerIndex];
    
    if(!layer.visible)
        continue;
    
    // ----------------------------------------------------
    // Loop through all frames of the current layer
    for(var frameIndex = 0; frameIndex < timeline.frameCount; frameIndex++)
    {
        var frameDeleteCount = 0;
        var frame = layer.frames[frameIndex];
        
        if(!frame)
            continue;
        
        // ----------------------------------------------------
        // Loop through all elements in the current frame
        for(var elementIndex in frame.elements)
        {
            var element = frame.elements[elementIndex];
            
            if(!element)
                continue;
            
            if(element.elementType !== 'shape')
                continue;
            
            // ----------------------------------------------------
            // Check each edge in the current shape
            for(var edgeIndex in element.edges)
            {
                var edge = element.edges[edgeIndex];
                var stroke = edge.stroke;
                var fill = stroke ? stroke.shapeFill : null;
                
                if(!fill)
                    continue;
                
                if(fill.color in coloursToDelete)
                {
                    stroke.shapeFill = null;
                    edge.stroke = fill;
                    deleteCount++;
                    frameDeleteCount++;
                }
            }
        }
        
        // A quirk of deleting strokes like this is that shapes won't automatically merge like they would when deleting a stroke in the editor.
        // Selecting then deselecting will force this to happen
        if(frameDeleteCount > 0)
        {
            dom.selectAll();
            dom.selectNone();
        }
    }
}

fl.trace('-- ' + dom.name + ': Deleted ' + (deleteCount) + ' strokes.');