Android: Dolphin Browser -- our pick for best browser on Android -- has updated and added the ability to customise the browser's design. The latest version also returns the browser's "night mode" and adds a master password feature.
Night mode was a popular feature that was (oddly) removed in a previous update, but now it's back in the form of an add-on. While you're exploring the Dolphin web store, you can find skins to alter the appearance of the browser. Finally, you can create a master password to access all of your other passwords stored within the browser.