I need to get the breadcrumb in the controller action because I am using the cache modules(FPC and another system externally). It cached the breadcrumb in the frontend page. With that, I would use ajax to get breadcrumb dynamically for better user experience.

The ajax is ready, there's only the breadcrumb part in my controller. Here are the codes made so far:

Ajax code:

<script type="text/javascript">
            url: '/fol_carousel/ajax/breadcrumb',
            type: "POST",
            dataType: "json",
            success: function(retorno){
            }, error: function(x,y,z){

Controller code:

public function breadcrumbAction(){
    echo json_encode("test");

Since the $_crumbs property is protected in Mage_Page_Block_Html_Breadcrumbs I think you'll have to extend the Block and make Magento use it instead of the default variant. In your extended block you could create a method that returns the breadcrumb data as array. Then you retrieve the breadcrumb block by doing $breadcrumbs = $this->getLayout()->getBlock("breadcrumbs"); and call your method on the variable.

To get Magento to use your block variant you'll need to place something like the following in the config.xml of a custom module:

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