Your speed is remembered. Set a lecture to 2x and the next video starts at 2x, instead of dropping back to normal every time. Press \ or click the speed readout to return to 1x, which is remembered the same way.

Every shortcut can be rebound. Open the toolbar popup, click a key, and press the one you want instead. If you choose a key another action already uses, the two swap places rather than collide.

Fixed: the shortcuts did nothing on many European keyboards. On German, French, Nordic and similar layouts, [, ] and \ are typed with AltGr, and Presto was discarding those presses. It no longer does.

Firefox for Android is now supported. The add-on can be installed on Android, and the popup is readable there instead of being squeezed into a corner of the screen.