Bug fixes. Sites keep working when the extension is updated, disabled or removed: before, a page's own play button could stop responding until the tab was reloaded. Play no longer picks media that is still playing as the one to resume. Media whose start was cut short by a pause is remembered. A video you unmute with a click counts as started by you.

First public release. Play/Pause pauses every playing tab and resumes only what you last started; works through Firefox's own media-key support.