Adobe has not supported Android with their Flash Player Plugin since last update on September 10, 20'''13'''. Firefox for Android since 56.0 has not supported this old vulnerable Plugin. Adobe stopped supporting their Flash Player Plugin (for Windows, macOS, Linux) at end of December 2020 and modern web browsers have not supported Flash since. https://support.mozilla.org/en-US/kb/end-support-adobe-flash Very few sites if any still use Flash player for video, audio and games now and most are using say HTML5 players for a few plus years now.