Confirmed, no French spelling dictionaries in 102.8.0. They were present in 102.6.1. en_US _does_ have them, it appears that localized builds do not. Looks like beta is affected as well, I'd wager Daily is too.
Bug 1818257 Comment 2 Edit History
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Confirmed, no French spelling dictionaries in 102.8.0. They were present in 102.6.1. Broken in 102.7.0+. en_US _does_ have them, it appears that localized builds do not. Looks like beta is affected as well, I'd wager Daily is too.