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KeyChain does not work very well on Firefox.
On Chrome/Brave it should work ;)

What a mess... Firefox users can't even vote my proposal.

Yeah firefox keychain app seems to be behind the times.

They can, but it seems they must use steemconnect.

Exactly... Steempeak + Steemconnect

Voted with my three big accounts, cheers!

Firefox do works. I voted (approved) your proposal on Firefox Quantum 69.0 (32-bit) with Steemconnect.
But the Steem KeyChain currently really does not work on this version of Firefox. The same thing is happening, which you included on the screenshot in your comment above.