[Niten]

No it does not, in fact it doesn't even work the way the author claimed. He or she mistook an activity bundled with the Firefox app for the Google Search app.

In reality that search history was never persisted outside the Firefox app.

[arcfor]

It only allows Google, despite my using another default search engine.

The data is certainly persisting somewhere outside of Firefox proper, as the search app is siphoning data that can only be cleared from within.

[Niten]

> The data is certainly persisting somewhere outside of Firefox proper, as the search app is siphoning data that can only be cleared from within.

That does not follow. They are the same application.

For example, attempt to reproduce this after pressing the Clear Data and Clear Cache buttons on Firefox's Android app info screen.