Version 1.4.0

• Optional account sync — create a free account to keep your
  progress in sync across all your browsers and devices.
  No account needed to use the extension — sync is always opt-in.
• Daily notification — your 3 words of the day now appear as
  a system notification each time you open your browser, so you
  can see them without needing to browse anything.
• New popup — click the extension icon to see today's 3 words
  clearly laid out with all the English words each sound replaces.
• Every day now unlocks exactly 3 new words across all 1,000 days.
• Firefox for Android supported.
• All progress stays on your device unless you choose to sync.

Added support for Firefox for Android. The extension now works on
mobile as well as desktop — words replace themselves as you browse
on Android just as they do on your computer.