Behind-the-scene websocket's not being filtered by uBO

[ryanbr]

Describe the issue

Filtering of websocket url's not working,

wss://a.bondinra.com/wsm

One or more specific URLs where the issue occurs

https://www.blacklistednews.com/ but there are many more.

Screenshot in which the issue can be seen

We have simplified these websocket rules recently; see; easylist/easylist@2b32ad7

||bondinra.com^ should be block by uBo. (but its not)

Your settings

• OS/version: Windows 10
• Browser/version: Firefox
• uBlock Origin version: 1.15.10

Your filter lists

Easylist/Easyprivacy

Your custom filters (if any)

[okiehsch]

Works fine with Chrome

With Firefox the filter does not work, because the request is labelled as "behind the scene".

To reproduce you have to disable uBO-filters.

[ryanbr]

How/why does it differ regarding Firefox "Behind the scene" vs Chrome?

[gorhill]

I don't know why Firefox reports as behind the scene -- maybe this can be fixed by Firefox devs. It's Uponit scripts, and there is a lot of trickery at work here, and it could be related to the use of an about:blank frame in some sort of way.

In any case, with Firefox there is more information available for webRequest listeners, and uBO should make use of this information for behind-the-scene network requests:

details = {
    documentUrl : "https://www.blacklistednews.com/"
    frameId : 0
    ip : null
    method : "GET"
    originUrl : "https://www.blacklistednews.com/"
    parentFrameId : -1
    proxyInfo : null
    requestId : "2676"
    tabId : "-1"
    timeStamp : 1519559704526
    type : "websocket"
    url : "wss://a.bondinra.com/wsm"
};

documentUrl and originUrl are not available on Chromium, but they could be used on Firefox to allow the request to be filtered despite being behind-the-scene.

[uBlock-user]

Does ||bondinra.com^$websocket work ?