This is incomplete on 91.0b2, resulting in a broken import dialog - we need to uplift the missing parts of this patch (comment 11). A string file from the patch got lost when landing this shortly before 91 went to beta (comment 9). The string file was then added on Daily 92 (comment 11). So it's still missing on the Beta 91 channel which will become the release (see screenshot of 91.0b2) - easy to fix by uplifting the missing bits.
Bug 1687543 Comment 12 Edit History
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This is incomplete on 91.0b2, resulting in a broken import dialog - we need to uplift the missing parts of this patch (comment 11). A new Fluent string file from the patch got lost when landing this shortly before 91 went to beta (comment 9). The string file was then added on Daily 92 (comment 11). So it's still missing on the Beta 91 channel which will become the release (see screenshot of 91.0b2) - easy to fix by uplifting the missing bits.