Neat URL Request types

Neat URL has some advanced options. One of those is to select your own list of request types you want to clean URLs for.

Request types you might want to include

I have set "sometimes used for tracking." when it's likely to contain some kind of (tracking) mess I have set "doubtful" when I think it's not worth it

To answer your question:

beacon

• Requests sent through the Beacon API.
• Sometimes used for tracking.

csp_report

• Requests sent to the report-uri given in the Content-Security-Policy header, when an attempt to violate the policy is detected.
• Doubtful

font

• Web fonts loaded for a @font-face CSS rule.
• Doubtful

image

• Resources loaded to be rendered as image, except for imageset on browsers that support that type (see browser compatibility below).
• Sometimes used for tracking.

imageset

• Images loaded by a picture element or given in an img element's srcset attribute.
• Doubtful

main_frame

• Top-level documents loaded into a tab.
• Often used for tracking e-mail or promotion campaigns.

media

• Resources loaded by a video or audio element.
• Doubtful

object

• Resources loaded by an object or embed element.
• Browsers that don't have a dedicated object_subrequest type (see browser compatibility below), also label subsequent requests sent by the plugin as object.
• Doubtful

object_subrequest

• Requests sent by plugins.
• Doubtful

ping

• Requests sent to the URL given in a hyperlink's ping attribute, when the hyperlink is followed. *Browsers that don't have a dedicated beacon type (see browser compatibility below), also label requests sent through the Beacon API as ping.
• Sometimes used for tracking.

script

• Code that is loaded to be executed by a <script> element or running in a Worker.
• Doubtful

stylesheet

• CSS stylesheets loaded to describe the representation of a document.
• Doubtful

sub_frame

• Documents loaded into an <iframe> or element.
• Useful

web_manifest

• Web App Manifests loaded for websites that can be installed to the homescreen.
• Doubtful

websocket

• Requests initiating a connection to a server through the WebSocket API.
• Doubtful

xbl

• XBL bindings loaded to extend the behavior of elements in a document.
• Doubtful

xml_dtd

• DTDs loaded for an XML document.
• Doubtful

xmlhttprequest

• Requests sent by an XMLHttpRequest object or through the Fetch API.
• Sometimes used for tracking.

xslt

• XSLT stylesheets loaded for transforming an XML document.
• Doubtful

other

• Resources that aren't covered by any other available type.
• Maybe