| User agent | Platforms | Hardware |
|---|---|---|
| Mozilla/5.0 (Android 2.2.3; Mobile; rv:21.0) Gecko/21.0 Firefox/21.0 | Android 2 | smartphone |
| Mozilla/5.0 (Android 6.0.1; Mobile; rv:21.0) Gecko/21.0 Firefox/21.0 | Android 6 | smartphone |
| Mozilla/5.0 (Android 3.2.6; Mobile; rv:21.0) Gecko/21.0 Firefox/21.0 | Android 3 | smartphone |
| Mozilla/5.0 (Linux; Android 4.1.1; fr-fr; SonyEricsson; C1505 Build/11.3.A.0.56; rv 21.0) Gecko/20130514 Mobile Firefox/21.0 | Android 4 | Xperia E |
| Mozilla/5.0 (Android; Mobile; rv:21.0) Gecko/21.0 Firefox/21.0 | Android | smartphone |