Скачиваем аудио вконтакте через клиентский js или расширение файлов .m3u8

if (url.match(/\.m3u8$/)) {
    var xhr = new XMLHttpRequest()
    xhr.open('GET', url, true)
    xhr.onload = function() {
        var data = xhr.responseText.split(/\n/)
        var base = ''
        var parts = []
        var p = []
        data.forEach(function(el) {
            var m = el.match(/URI="([^"]+)"/)
            if (m) {
                base = m[1].split(/\//).slice(0, -1).join('/')
            } else {
                m = el.match(/\.ts\??/)
                if (m) parts.push(el.slice(0, -1))
            }
        })
        //console.log(base)
        function fetchNext() {
            var req = new XMLHttpRequest()
            req.open('GET', base + '/' + parts[index], true)
            req.responseType = 'blob'
            req.onload = function() {
                p[index] = req.response
                index++
                //console.log(req.response)
                if (index < parts.length) fetchNext()
                else saveStream()
            }
            req.send(null)
        }

        var index = 0
        fetchNext()

        function saveStream() {
            var blob = new Blob(parts, {type : 'audio/m2ts'})
            var url = URL.createObjectURL(blob)
            var a = document.createElement('a')
            a.download = getFileName().split('.')[0] + '.ts'
            a.href = url
            document.body.appendChild(a)
            a.click()
            document.body.removeChild(a)
        }
    }
    xhr.send(null)
}