Confirmed in Windows Sandbox, update from Fx126->Fx127. Update shouldn't touch this code afaik.
STR
Install an older version of Firefox.
Flip browser.cache.disk.enable to false.
Update Firefox and restart.
Check the browser.cache.disk.enable value.
Bug 1903580 Comment 6 Edit History
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Confirmed in Windows Sandbox, update from Fx126->Fx127. Update shouldn't touch this code afaik. That said, [I don't see any code](https://searchfox.org/mozilla-central/search?q=browser.cache.disk.enable&path=®exp=false) that modifies this value in source at all, so I'm a bit perplexed. STR Install an older version of Firefox. Flip browser.cache.disk.enable to false. Update Firefox and restart. Check the browser.cache.disk.enable value.