Input duplication in firefox/android

**Describe the bug**
Entering single word lines in firefox on android results in lines duplication

**To Reproduce**
Steps to reproduce the behavior:
1. Go to the project's demo site in firefox on android
2. Scroll to the bottom of the text, hit enter to get to a new line.
3. Type a word, hit enter
4. Type another word, hit enter
5. See the second word you typed appears twice
6. more single words continue to duplicate

**Expected behavior**
text should not be duplicated

**Screenshots**

** Version information **
- OS: Android
- Browser:Firefox 84.1.4
- EasyMDE version: 2.13.0

**Additional context**