Today I got Netflix to work at my first try, when in the past this was a pain, now is a simple task.
Install chromium-widevine from the aur.
Install python-jade-application-kit from the repos.
jak-cli --url https://www.netflix.com --title NETFLIX --online true
Voilà all Done, press F11 for fullscreen experience, Enjoy.
You know ... could just package this as 'manjaro-netflix' or 'jade-netflix' or 'webdad-netflix'. 
It seems pretty trivial to set up .. but a package is how more folks would more easily consume it.
[btw - does this mean you got 1080p, etc working too?]
We would have to package widevine, not sure about the license on that, also has to be approved by @philm
1080 should work, maybe change in the settings from auto to full.
Oh sure - but it can always at least start in the AUR (especially if you skipped the manjaro branding) ... or stay there if the licensing stuff is a thing.
just a thought.
in any case - nice job 
ahm ... My rountine always was:
Firefox is preinstalled and includes a widevine plugin.
but doesnt that still keep capped to 720 ?
how does one check that? I always watch in a window on a secondary 1440p screen, for me it looks sharp
This way is more like a native app ish. without electron.
I think this is the way:
https://www.netflix.com/title/80018499
[if you are using chrom* you can use ctrl+shift+alt+s, but I dont know it for firefox]
Edit - when I was ggling around for some info I stumbled upon this very odd image for chromium:
????
Its a chrome plugin to run IE engine, mainly for web developers.
I see. Still odd that G uses that as the icon for the chromium browser...
Probably made by the guy that does the plugin and not G, I think it was discontinued now.
Only way I know to get 1080p forced on Linux are from add-ons:
I could implement this https://github.com/truedread/netflix-1080p or something similar, since JAK already supports custom JavaScript.
I am not sure if is wise to force 1080 playback, if is switched off is for a reason.
There is no good reason. They want you to use Windows & Microsoft Edge to get the best resolution. Probably getting paid to do so.
https://help.netflix.com/en/node/23742
Agreed.
Even the big magazines use phrases like 'the seemingly arbitrary decision to block 1080p..'
As to the plugin @codesardine - I am not familiar - but it enables 1080p when you have set the relevant 'full' or 'auto' settings, right? not just force 1080p all the time for everyone, right?
I could be wrong, but I think all the plugin does is injects a manifest of another browser so that Netflix can be ran at 1080p.
I would have to look in to it 
Looking into to that link the reason seems to be the inability to detect Linux graphic cards, and provide the best experience, I might be wrong
Corporate lies 
Theyve said multiple things over time - one of my favorites was something along the lines of 'linux is a hacker OS and we dont want piracy'
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