Thank you for your feedback, we are still evaluating the font size increase, this is Nightly after all, it's made to test changes and collect feedback before those changes are released. What you are reporting is likely similar to bug 1601320. This is preparatory design work for a lot of new interesting features that will come in the future, the final scope is to make the whole searching experience more pleasant and understandable. Oviously design changes are subjective and may not please everyone.
Bug 1561531 Comment 55 Edit History
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Thank you for your feedback, we are still evaluating the font size increase, this is Nightly after all, it's made to test changes and collect feedback before those changes are released. What you are reporting is likely similar to bug 1601320. This is preparatory design work for a lot of new interesting features that will come in the future, the final scope is to make the whole searching experience more pleasant and understandable. Obviously design changes are subjective and may not please everyone.