I found that this has a better experience if you make the browser full screen. For those who don't know. In the guide above. Where you are adding options to KOBOeReader/.kobo/Kobo/Kobo eReader.conf. Under [FeatureSettings].
Add
FullScreenBrowser=true
In your nickel menu config, you can also add the following option.
menu_item :browser:Quit:nickel_misc:home
https://i.imgur.com/aMLLoBH.jpg
https://i.imgur.com/w5YFhjH.jpg