Does this strip UTM tokens before or after web request is made?

[BillyJoeJimBob]

I am curious as to whether the Safari UTM Stripper add-on strips tracking tokens from URLs before a web request is made to actually limit tracking (like the Jon Parise Chrome add-on referenced in github) or does it only do purely aesthetic post-processing (like the Mihai Parparita add-on).

Thank you.

[grahams]

    safari.application.addEventListener("beforeNavigate", function (e) {
        var originalURL = e.url;