Version 1.3 won't install.
Get dialog warning, "“Choosy.prefPane” is damaged and can’t be opened. You should move it to the Trash." I however was able to install and run Choosy version 1.2.2. I'm running OS X Yosemite 10.10.5 (14F2511).
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Choosy 1.3 requires macOS 10.12 or later. For OS X 10.10, you’ll need to use Choosy 1.1 or earlier.