Idea: play sound when timer ends?

[nfreear]

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• Stackoverflow: 27496465 / how can i play sound-in-a-chrome-extension?,
• Chrome Dev: extensions / Offscreen API,
• MDN: Add-ons / background page,

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• [x] — functionality using offscreen API - Chromium / Chrome,
• [ ] — functionality using background.page - Gecko / Firefox,
• [ ] — Add option to switch sound on/off,
• [ ] — Add WAV/MP3/OGG audio file to extension package.

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Sound files?

• Search: https://commons.wikimedia.org/w/?title=Special:MediaSearch&type=audio&search=bell,
• Search 2: https://commons.wikimedia.org/w/?title=Special:MediaSearch&type=audio&filemime=wav&search=bell,
• https://commons.wikimedia.org/wiki/File:Ding_Dong_Bicycle_Bell_A.ogg,
• https://commons.wikimedia.org/wiki/File:Bicycle-bell-1.wav [**]
• https://commons.wikimedia.org/wiki/File:Old_school_bell_4.ogg,
• https://commons.wikimedia.org/wiki/File:Taco_Bell_Bong.ogg,
• https://commons.wikimedia.org/wiki/File:Wagner_Parsifal_Bell_Motif.ogg,
• https://commons.wikimedia.org/wiki/File:Kleins%C3%B6ding_11-Uhr-L%C3%A4uten.mp3,
• Bird: https://commons.wikimedia.org/wiki/File:Vireo_bellii_-_Bell%27s_Vireo_XC102965.mp3,
• Bicycle: https://commons.wikimedia.org/wiki/File:Classic_Bicycle_Bell_recorded_by_Frick_%26_Traa.wav,
• Church: https://commons.wikimedia.org/wiki/File:Rouillac-12H30_cutted.wav,

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