On Android, I've been using Kiwi Browser [0]. It's Chrome but supports extensions from the webstore like desktop chrome, and has a dark mode toggle in the menu that applies custom CSS to webpages. Also has devtools, bottom navigation bar, and a setting to disable tab grouping.

[0] https://play.google.com/store/apps/details?id=com.kiwibrowse...

Use Firefox with 'Ublock Origin' and add one of the following to it's 'My Filters' section:

https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...

On Android Firefox, "Dark Reader" supports HN.

Firefox Mobile supports plugins. You save a ton of battery life just running UBlock Origin with it

Firefox on Android has some plugins that can do this.

On iOS, I use Smart Invert.