Homestuck Companion by Makin

Homestuck Companion displays all existing commentary for Homestuck (up to the end of Disc 2, two thirds through ACT 5 ACT 2) and Problem Sleuth.

It also links your browser to the Unofficial Homestuck Collection (https://bambosh.github.io/unofficial-homestuck-collection/), redirecting Homestuck.com links to the appropriate collection URL in real time. You can use the Homestuck Commentary extension (https://homestuck.net/tools/collection-mods.html) to get the ultimate experience.

To see the in-browser commentary: just go to a supported URL like "https://homestuck.com/001902" or "https://homestuck.com/002413" and behold the commentary. Use the extension options in order to disable commentary display, if you just want the controls.