Why tune your piano when you could tune youtube instead?
Video Tuner Extension
Updates planned for the future: integrate transposition option into instrument feature so they work at the same time, at the moment, you can either transpose based on a number of semitones OR based on the instrument, but not both.
Note: there have been a couple issues with this extension messing with the CSS of websites. The issues have mostly been fixed but if you notice your favourite website now looks weird, consider disabling this while you're not actively using it.
Source Manifest.json
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User reviews
bb bb (ID: 000000b00c0d6228) Voted 5 ★ - Updated 12/26/2022
I have no Idea (?) (ID: 0000008ccb23df06) Voted 1 ★ - Updated 07/26/2022
John Mustin (ID: 000000bb03c18dab) Voted 3 ★ - Updated 11/05/2021
English Rain (ID: 0000000d783c2c53) Voted 5 ★ - Updated 04/28/2021
Shr3dL0rd (ID: 000000170e8deb6b) Voted 5 ★ - Updated 12/13/2020