Use storage.sync so that the consent can be saved in the syncable browser storage

When having to reinstall my system (and thus firefox), I login with my firefox account that syncs my extensions. But I often forget to enable the consent for the snowflake extension.

It would be nice if the extension could save the consent in the synced storage https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/sync so that when you sign into firefox with your firefox account, it'll remember you consented and activated