Created attachment 8873317 [details] Minimal extension for testing Steps to reproduce: * Install the attached extension (either as a temporary add-on via about:debugging or by disabling signing requirements). * Go to https://adblockplus.org/ * Press Ctrl+Shift+J to open Browser Console and look at the log entries prefixed with "**** beforerequest" - these contain the request ID, frame ID and URL for all requests reported via browser.webRequest.onBeforeRequest. I tested this in Firefox 55.0a1 (2017-05-31 nightly) on Ubuntu. Expected results: Requests associated with the main frame have a zero frame ID. Only the requests made by the YouTube frame have a non-zero frame ID. This behavior is documented under https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/webRequest/onBeforeRequest#details Actual results: Only the document itself has frame ID 0. All requests made by the document (such as https://adblockplus.org/css/main.css) have a non-zero frame ID, and the requests associated with the YouTube frame merely have a different non-zero frame ID. This behavior is breaking Adblock Plus (the Web Extensions build) because requests cannot be attributed to a document properly.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1367138
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