SafeEval

/* Copy/paste this into browser DevTools console. */
;(async () => {
    async function dumpDatabase(dbName) {
        var dbExists = await new Promise(resolve => {
            var request = window.indexedDB.open(dbName)
            request.onupgradeneeded = e => {
                e.target.transaction.abort()
                resolve(false)
            }
            request.onerror = () => resolve(true)