Issue Summary

Typing at end of an existing line in code block merges with the below line, on Firefox

Steps to Reproduce

1. Create a code block
2. Type two lines of content into the code block
3. Go to the end of the first line and type anything
4. The second line will be appended to the first line

Expected Results

The below line should not get appended to the existing line

Actual Results

The below line is getting appended to the existing line

Workaround

Use Chrome browser