Not Kodi, But Add Fire to your build
https://www.youtube.com/watch?v=yd1xotCxUd0
The Firefox here is in spanish I believe. but you can always change it by downloading firefox-60.7.0esr.tar.bz2 (ENG)
Extract it, Then drag it paste it here (SHARE/roms/pc/Mozilla-Firefox.pc/firefox-esr/ )
Overwrite all
Then add this to es_systems.cfg (SHARE/system/configs/emulationstation/)
<system>
<fullname>Application</fullname>
<name>pc</name>
<path>/userdata/roms/pc</path>
<extension>.pc .PC</extension>
<command>%ROM%/batocera.sh;</command>
<platform>pc</platform>
<theme>pc</theme>
</system>
if it's not there, I believe it's somewhere in usr/ folder in batocera after pressing f1
Find it (es_system.cfg), copy it and paste it to
SHARE/system/configs/emulationstation/
open it up
Then Add
<system>
<fullname>Application</fullname>
<name>pc</name>
<path>/userdata/roms/pc</path>
<extension>.pc .PC</extension>
<command>%ROM%/batocera.sh;</command>
<platform>pc</platform>
<theme>pc</theme>
</system>
Then Set your internet to your liking, Log in on netflix and go happy watching netflix.