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Firefox to become first mobile browser to support desktop extensions later this year
(blog.mozilla.org)
This is a most excellent place for technology news and articles.
Which is odd considering it’s been a “first class citizen” on iPadOS by supporting features: https://www.lowyat.net/2019/181498/the-new-firefox-for-ipad-now-supports-split-screen-tab-tiles-keyboard-shortcuts-and-more/
Vivaldi is great though, I hope you’ve enjoyed it thus far!
iOS/iPad OS is relatively much easier to develop and it's a completely different branch from Android as it's a skin on top of Safari Web View. All other platform use their own Quantum/Gecko Engine.
Right, however, a basic tablet UI which Firefox previously had and many browsers have shouldn’t be hard for Mozilla to implement on Android.
Android has scaling so a tablet UI should look normal on most devices.