The extension keeps no keys of its own — it talks to the Mango wallet app running on this computer, so that app has to be open.
Create a new Chia wallet, or bring one you already have. Either way it takes about a minute and never leaves this browser tab.
This unlocks the extension on this browser.
These 24 words are your wallet. Write them down on paper, in order.
Type three of the words back, so we know the copy you made is good.
Paste your 12 or 24 word recovery phrase, separated by spaces.
Pin Mango wallet to your toolbar to reach it quickly. Sites you visit can ask to connect, and you approve each one from the popup.