Steps to reproduce:
Install uBlock Origin (Firefox version) on Orion
Open open.spotify.com in a private window (not signed in)
Open uBO’s logger (click uBO icon → logger icon)
Observe that network requests are intercepted and blocked normally
Sign in to a Spotify account
Observe that uBO’s logger stops showing any XHR traffic — blocked count drops to 0 (0%), only cosmetic filters and scriptlets continue working
Additional details:
uBO’s webRequest API stops intercepting XHR requests on Spotify once signed into an account. The same uBO on Arc (Chromium) shows 42 blocked requests on the same page while Orion shows 0.
What still works after sign-in: scriptlet injection (set-constant, trusted-click-element), cosmetic filtering, removeparam rules.
What breaks after sign-in: all network-level request blocking — gabo-receiver-service (ad event tracking), doubleclick.net (ad serving), sentry.io (telemetry), and spotifycdn.com/audio (ad audio redirect) are all invisible to uBO.
Orion’s built-in content blocker also fails to catch these requests when signed in, even with custom filters targeting them. Both blocking layers (webRequest + native WebKit content blocking) appear to miss credentialed XHR traffic.
This likely affects other authenticated web apps, not just Spotify. uBO works fine on non-authenticated sites (e.g., brickset.com shows 7 blocked requests correctly).
Likely cause: WebKit has separate networking paths for credentialed vs. non-credentialed requests. Orion’s webRequest hooks may only be attached to the non-credentialed path.
Orion uBO stats:
uBO should continue intercepting and filtering XHR network requests after signing into Spotify, the same way it does on Arc (Chromium) and Firefox with the same extension and filter lists. Specifically, uBO’s redirect-rule filter (*$media,3p,redirect-rule=noop-1s.mp4:10,from=open.spotify.com) should fire to replace ad audio with a silent stub, which is how Spotify ad blocking works on every other browser. Instead, uBO never sees the requests and audio ads play through unblocked.
Arc uBO stats on Spotify (what we would expect):
Orion Version 1.0.6 (145), WebKit 624.1.7, Mac 26.4.1
Tahoe (26)
