[orca-list] On Firefox, when moving on a line, Orca reads the whole paragraph

[Alex ARNAUD <alexarnaud hypra fr>]

Hello,

Environment:
- Debian 9 "Stretch"
- Firefox 68
- Orca master

Steps to reproduce:
1) Open this page: 
https://www.clubic.com/pc-portable/actualite-866407-samsung-galaxy-book-ordinateur-arm-autonomie-dementielle.html
2) Place the cursor on the header "Un ultrabook autonome et toujours 
connecté"
3) Move the cursor the line after the header

Result:
Orca reads multiple lines

Expected result:
Orca should only read "Le Galaxy Book S embarque la nouvelle puce Qualcomm"

Best regards,
Alex.