This will grant @minnowschool POST auth on your account, which activates the algo that gives you upvotes, and supports other members with your accounts voting power.
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Why isn't this based on STEEMCONNECT?
STEEMCONNECT is no longer available on STEEMIT, it was migrated to HIVECONNECT, so we use this tool to do the join signing
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Is this safe?
It's as safe as any other curation trail on steemit, you can check the source code for this open source signer on: https://glitch.com/edit/#!/schoolofminnows none of your private information leaves the browser.