[Bug]: Gecko child processes fails/timeouts

[aletschfirn]

Pre-Submission Checklist

• [X] I have checked the existing/closed issues to ensure this issue has not already been reported.
• [X] I am using the latest supported version of the browser.
• [X] I have tried disabling all browser extensions/add-ons to rule out interference from these.
• [X] I have tried clearing the browser cache and cookies.
• [X] I have checked with a new profile and the issue still occurs.
• [X] I have provided detailed step-by-step instructions on how to reproduce the issue.
• [X] I have included relevant screenshots or console outputs.
• [ ] I have checked that this problem is not occurring in the latest version of Firefox ESR.
• [ ] This issue is specific to this browser and does not occur in other browsers.

Bug Summary

With SIP (System Integrity Protection) set to such of configuration:

~/ csrutil status
System Integrity Protection status: unknown (Custom Configuration).

Configuration:
	Apple Internal: disabled
	Kext Signing: disabled
	Filesystem Protections: disabled
	Debugging Restrictions: enabled
	DTrace Restrictions: enabled
	NVRAM Protections: enabled
	BaseSystem Verification: enabled

Gecko child processes fails to launch, making it impossible to load any tab:

[Parent 3150, IPC Launch #1] WARNING: parent MachReceivePortSendRight failed: 0x10004003 (ipc/rcv) timed out: file /home/runner/work/Floorp/Floorp/ipc/glue/GeckoChildProcessHost.cpp:1535
[Parent 3150, IPC I/O Parent] WARNING: Failed to launch utility subprocess @MachReceivePortSendRight (Error:268451843): file /home/runner/work/Floorp/Floorp/ipc/glue/GeckoChildProcessHost.cpp:821

Even the start page is blank:

Besides pages being blank, browser itself takes up to 3 minutes to just start, spamming same error over and over again...

Full logs: floorp.log Related issue on bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1852029 The thing is that on bugzilla, for reported, it occurred because of F-secure, which I don't use, and it's happening because of turned off SIP...

Reproduction Steps

1. Turn off SIP (Apple's guide)
2. Install Floorp (from website)
3. Try to run Floorp

Expected Behavior

1. Try to run Floorp
2. Floorp loads just fine and tabs do work + Gecko doesn't fail

Actual Behavior

1. Try to run Floorp
2. Tabs won't load at all - any of, even settings from top bar can't be opened

Screenshots

Browser Version

11.20.0

Operating System

macOS Monterey 12.7.6 (21H1320)

Additional Context

No response