Duplicate IPC marker found warning in profiler console

(this issue is moved from from https://bugzilla.mozilla.org/show_bug.cgi?id=1971987)

When I open an [auto-generated CI profile](https://profiler.firefox.com/from-url/https%3A%2F%2Ffirefox-ci-tc.services.mozilla.com%2Fapi%2Fqueue%2Fv1%2Ftask%2Fc0GF5C00ToecCR5xLx59kw%2Fruns%2F0%2Fartifacts%2Fpublic%2Ftest_info%2Fprofile_speedometer3.zip/marker-chart/?file=speedometer3-benchmark%2Fiteration-1.json.gz&globalTrackOrder=0w9&hiddenGlobalTracks=1w8&hiddenLocalTracksByPid=2630-0w578awc~2636-0w6~2632-0~2638-0~2635-0~2641-0w3~2640-0w3~2652-0w3~2634-0w6~2639-57&thread=x7&v=10) with IPC markers enabled, and then go to the devtools console, I get a flood of
```
Duplicate IPC marker found for key 3957,3948,0,EVENT_MESSAGE marker-data.js:508:19
Duplicate IPC marker found for key 3948,3957,0,EVENT_MESSAGE 2 marker-data.js:508:19
Duplicate IPC marker found for key 3957,3948,0,EVENT_MESSAGE marker-data.js:508:19
Duplicate IPC marker found for key 3948,3957,0,EVENT_MESSAGE 2 marker-data.js:508:19
Duplicate IPC marker found for key 3957,3948,0,EVENT_MESSAGE marker-data.js:508:19
Duplicate IPC marker found for key 3948,3957,0,EVENT_MESSAGE 4 marker-data.js:508:19
Duplicate IPC marker found for key 3957,3948,0,EVENT_MESSAGE marker-data.js:508:19
Duplicate IPC marker found for key 3948,3957,0,EVENT_MESSAGE 2 marker-data.js:508:19
```
messages.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-914)