diff --git a/netwerk/base/nsILoadInfo.idl b/netwerk/base/nsILoadInfo.idl
index 7fc57124ecfe..ddfcb223e612 100644
--- a/netwerk/base/nsILoadInfo.idl
+++ b/netwerk/base/nsILoadInfo.idl
@@ -1420,6 +1420,8 @@ interface nsILoadInfo : nsISupports
   const uint32_t BLOCKING_REASON_NOT_SAME_ORIGIN = 5000;
   // The reason used when an extension cancels the request via the WebRequest api.
   const uint32_t BLOCKING_REASON_EXTENSION_WEBREQUEST = 6000;
+  // The reason used when a request is cancelled via WebDriver BiDi network interception.
+  const uint32_t BLOCKING_REASON_WEBDRIVER_BIDI = 7000;
 
   /**
    * If the request associated with this load info was blocked by some of
diff --git a/remote/webdriver-bidi/modules/root/network.sys.mjs b/remote/webdriver-bidi/modules/root/network.sys.mjs
index d938150963ca..09545d9a4cb7 100644
--- a/remote/webdriver-bidi/modules/root/network.sys.mjs
+++ b/remote/webdriver-bidi/modules/root/network.sys.mjs
@@ -462,6 +462,53 @@ class NetworkModule extends Module {
     resolveBlockedEvent();
   }
 
+  /**
+   * Fails a request that is blocked by a network intercept.
+   *
+   * @param {object=} options
+   * @param {string} options.request
+   *     The id of the blocked request that should be continued.
+   *
+   * @throws {InvalidArgumentError}
+   *     Raised if an argument is of an invalid type or value.
+   * @throws {NoSuchRequestError}
+   *     Raised if the request id does not match any request in the blocked
+   *     requests map.
+   */
+  async failRequest(options = {}) {
+    this.assertExperimentalCommandsEnabled("network.failRequest");
+    const { request: requestId } = options;
+
+    lazy.assert.string(
+      requestId,
+      `Expected "request" to be a string, got ${requestId}`
+    );
+
+    if (!this.#blockedRequests.has(requestId)) {
+      throw new lazy.error.NoSuchRequestError(
+        `Blocked request with id ${requestId} not found`
+      );
+    }
+
+    const { phase, request, resolveBlockedEvent } =
+      this.#blockedRequests.get(requestId);
+
+    if (phase === InterceptPhase.AuthRequired) {
+      throw new lazy.error.InvalidArgumentError(
+        `Expected blocked request not to be in "authRequired" phase`
+      );
+    }
+
+    const wrapper = ChannelWrapper.get(request);
+    wrapper.resume();
+    wrapper.cancel(
+      Cr.NS_ERROR_ABORT,
+      Ci.nsILoadInfo.BLOCKING_REASON_WEBDRIVER_BIDI
+    );
+
+    resolveBlockedEvent();
+  }
+
   /**
    * Removes an existing network intercept.
    *
@@ -575,6 +622,10 @@ class NetworkModule extends Module {
     };
   }
 
+  #getSuspendMarkerText(requestData, phase) {
+    return `Request (id: ${requestData.request}) suspended by WebDriver BiDi in ${phase} phase`;
+  }
+
   #getNetworkIntercepts(event, requestData) {
     const intercepts = [];
 
@@ -809,7 +860,10 @@ class NetworkModule extends Module {
     if (beforeRequestSentEvent.isBlocked) {
       // TODO: Requests suspended in beforeRequestSent still reach the server at
       // the moment. https://bugzilla.mozilla.org/show_bug.cgi?id=1849686
-      requestChannel.suspend();
+      const wrapper = ChannelWrapper.get(requestChannel);
+      wrapper.suspend(
+        this.#getSuspendMarkerText(requestData, "beforeRequestSent")
+      );
 
       this.#addBlockedRequest(
         beforeRequestSentEvent.request.request,
@@ -982,7 +1036,10 @@ class NetworkModule extends Module {
       protocolEventName === "network.responseStarted" &&
       responseEvent.isBlocked
     ) {
-      requestChannel.suspend();
+      const wrapper = ChannelWrapper.get(requestChannel);
+      wrapper.suspend(
+        this.#getSuspendMarkerText(requestData, "responseStarted")
+      );
 
       this.#addBlockedRequest(
         responseEvent.request.request,
diff --git a/testing/web-platform/meta/webdriver/tests/bidi/network/fail_request/invalid.py.ini b/testing/web-platform/meta/webdriver/tests/bidi/network/fail_request/invalid.py.ini
deleted file mode 100644
index f2f31280e03d..000000000000
--- a/testing/web-platform/meta/webdriver/tests/bidi/network/fail_request/invalid.py.ini
+++ /dev/null
@@ -1,27 +0,0 @@
-[invalid.py]
-  [test_params_request_invalid_phase]
-    expected: FAIL
-
-  [test_params_request_invalid_type[None\]]
-    expected: FAIL
-
-  [test_params_request_invalid_type[False\]]
-    expected: FAIL
-
-  [test_params_request_invalid_type[42\]]
-    expected: FAIL
-
-  [test_params_request_invalid_type[value3\]]
-    expected: FAIL
-
-  [test_params_request_invalid_type[value4\]]
-    expected: FAIL
-
-  [test_params_request_invalid_value[\]]
-    expected: FAIL
-
-  [test_params_request_invalid_value[foo\]]
-    expected: FAIL
-
-  [test_params_request_no_such_request]
-    expected: FAIL