Try enabling the loopback device

Author: cwoffenden

.circleci/config.yml

@@ -356,12 +356,17 @@ commands:
       - run:
           name: configure firefox
           command: |
+            # Some before and after tests to try enabling a sound device:
+            lsmod | grep snd
+            modprobe snd-aloop
+            lsmod | grep snd
             mkdir ~/tmp-firefox-profile/
             cat > ~/tmp-firefox-profile/user.js \<<EOF
             user_pref("gfx.offscreencanvas.enabled", true);
             user_pref("javascript.options.shared_memory", true);
             user_pref("javascript.options.wasm_memory64", true);
             user_pref("dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled", true);
+            user_pref("media.autoplay.default", 0);
             EOF
       - run:
           name: run tests (<< parameters.title >>)
@@ -371,8 +376,6 @@ commands:
             #       support in headless mode) resolves
             EMTEST_LACKS_GRAPHICS_HARDWARE: "1"
             EMTEST_LACKS_WEBGPU: "1"
-            # TODO: replicate with FF the same as CHROME_FLAGS_AUDIO
-            EMTEST_LACKS_SOUND_HARDWARE: "1"
             # OffscreenCanvas support is not yet done in Firefox.
             EMTEST_LACKS_OFFSCREEN_CANVAS: "1"
             EMTEST_DETECT_TEMPFILE_LEAKS: "0"