This extension replaces English words with [LANGUAGE] phonetic
equivalents as the user browses. All logic runs from locally
bundled scripts. No remote code. No data collection. No network
requests. Storage is used only to save the user's vocabulary
progression locally on their device.

No build process. No minification. No webpack or code generators.
The submitted zip contains plain, human-readable JavaScript exactly
as it runs. No source code package is required as the zip itself
is the source.

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.