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We send you a Netscape cookie file. That file is the login. It proves you’re signed into Microsoft as the alt. Works on every Minecraft version, lasts way longer than a token, and you don’t need an email or password.
Easiest method — Some clients have cookie login built right into their account manager. No browser, no extension.
  • Rise Client — Account Manager → Add Account → Cookie → paste → done
  • Several other modern ghost/utility clients ship the same feature — check your client’s Accounts UI
If your client doesn’t support cookies directly, do it manually through a browser.
1

Install Cookie Quick Manager

Get Cookie Quick Manager (Firefox addon)
2

Open the Extension

Click the Extensions icon in your Firefox toolbar, then click Cookie Quick Manager, then click Manage
3

Import Cookies

In the bottom-left corner, click the third button from the left (looks like an export icon), then click Restore cookies from a file and select the cookie file you got from MOG Alts
4

Verify Login

Open minecraft.net — you should see the alt’s username in the top-right
5

Launch Client

Use a client that supports cookie login (Rise, etc.) and log in there. The official Minecraft Launcher does not work — it forces a fresh Microsoft sign-in and ignores the browser session.

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Troubleshooting

Clear your existing minecraft.net cookies first, then re-import. Old session data can conflict.
The official Minecraft Launcher doesn’t support cookie login. Use Rise or another client with native cookie import.