Mozilla Clarifies on Data Collection: Firefox Labs to Not Require Telemetry or Studies in Future Updates
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TL;DR: Mozilla has shifted from the forced telemetry introduced in Firefox 138 for Firefox Labs. Hours after I posted about the Labs change, Mozilla opened bug 1972647, which describes a change to Labs to allow it to be used when telemetry or studies are disabled.

Starting in Firefox 138, Mozilla started gating Firefox Labs features behind data collection.

Mozilla had announced that some new Firefox features would be released via Firefox Labs.

It is now a few hours since I posted, and there is reason to celebrate – Mozilla is updating Firefox Labs to let people access features without needing to enable data collection.