I've verified that this issue is no longer reproducible, the detectOnly pref is toggled after enabling the feature from the about:preferences page. Tested using Firefox Nightly Version 112.0a1, Build ID 20230220165121 and Firefox Beta Version 111.0b3, Build ID 20230219190218 on Windows 10 x64, macOS 12.5 and Ubuntu 22.04 x64.
Bug 1817201 Comment 9 Edit History
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I've verified that this issue is no longer reproducible, both service.mode prefs are toggled after enabling the feature from the about:preferences page. Tested using Firefox Nightly Version 112.0a1, Build ID 20230220165121 and Firefox Beta Version 111.0b3, Build ID 20230219190218 on Windows 10 x64, macOS 12.5 and Ubuntu 22.04 x64.