Kudos from one of the Soundslice guys — we've been making web-based tab and sheet music stuff since 2012. :)
That said, it's the fastest way to get a track into some player, define loop points easily, and then write down what I need to along with the player. I can jot down chords, lyrics, tabs of riffs, etc. I've tried tons of solutions over the years like sooperlooper, ableton live, reaper, winamp, youtube. this is by far the easiest, with just the right set of tools. It also doesn't do any of it automatically, so there's not even a temptation to skip practicing my ear.
So as you play the audio (with slowdown, looping, etc.), you can immediately write down what you figured out, and that written notation stays synced with the original recording. This workflow for transcription is fantastic, because otherwise you're juggling multiple apps (audio playback/slowdown, plus notation software).
Since you asked about MuseScore: MuseScore is purely scoring software, without the ability to sync with real audio. You can also use Soundslice as a pure sheet music editor; the main difference is it's web-based as opposed to being a desktop app like MuseScore. Soundslice also has the philosophy that the music might always be displayed on different devices, so it's engraved on the fly depending on your screen dimensions. (MuseScore sort of assumes the end result will be a fixed-dimension such as paper.)
Heck I'm going to say it: tabs actually aren't the medium you want anyway. After getting up and running on guitar, players know what all the chords look like so only need the names with perhaps the fret position as a guide to the voicing.