The screenshot is from an iPhone, on which uBlock isn't an available option.

Glazba. It's a music player that allows for playing files in various formats, including FLAC. Song files can be uploaded to the phone through the app via web browser over Wi-Fi, or it can play music files stored on any of several cloud-storage services. Considering that I've ripped my entire 1000+ CD collection to FLAC, and considering that my collection contains a number of albums not available through streaming services, this app has been quite useful.