A vibration is not normal.
I assume that you haven't taken the tire off recently. If you have, are you sure that you remounted the rim properly on the hub.
If the tire is mounted properly, check to see if the balance weight has fallen off the left front tire rim. If it has, then a re-balancing is in order. Re-balancing may be needed anyway if all of the suspension components are in good shape.
Sometimes a warped brake rotor will cause a shimmy. I would expect such a source to increase the vibrations as the speed increases.
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