Hi, @greencross, I am from @SnaxTeam. Browser extension is needed to use snax.one UI to bind your social accounts to Snax and to make transactions (just a wallet functions).
All the content you create, is grabbed automatically by the oracle
the whole code of Snax extension is open sourced https://github.com/SnaxFoundation/snax-browser-extension. We use clipboard permission to copy mnemonic phase which can be used to create an asymmetric private key. Also we use it to copy your export private key: But that’s it. You can see the same permissions for Google Docs Offline, for example