On Ubuntu both Firefox and chromium I encounter issues with the shortcuts (The navigator catch them instead of the page). I'm only able to load examples with chrome (using shortcut alt+e). The shortcut menu doesn't open with Firefox. In chrome, the visualization is not working but the sound is. In Firefox the visualization is kind of working but the sound isn't. Interesting sound synthesizer with a gnu radio vibe.
For me, Firefox on Debian, the only working shortcut is the Menu (which is not actually a menu in the normal UI sense, more like a menu in a restaurant).
Shortcuts are always difficult with web apps.
For this reason, I would always add an actual clickable menu to web apps.
