Adds commentary, keyboard navigation and useful info to the pages of Homestuck.com stories.
Homestuck Companion currently displays partial commentary for Homestuck (up to and including ACT 4), complete commentary for Problem Sleuth and enables keyboard navigation for both.
To use: just go to a supported URL like "https://www.homestuck.com/problem-sleuth/10" or "https://www.homestuck.com/story/513" and behold the commentary. Use the extension options in order to disable commentary display, if you just want the controls.
Keyboard controls (arrow keys for changing pages, right ctrl key for opening/closing pesterlogs) work on every page of Problem Sleuth and Homestuck.