[orca-list] orca jumps from some lines while selecting a text on Firefox

[Shadyar Khodayari <shadyar81 gmail com>]

You can test this problem your self. Open this web page in Firefox
https://askubuntu.com/questions/896860/usr-bin-env-python3-r-no-such-file-or-directory
try to select the first answer entirely, you will see Orca jumps while
selecting.
I'm using Ubuntu 20.4