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This plugin adds Theme menus in the admin bar. 
You can switch and activate the theme on the admin bar. 
You don’t need to go to the administration screens to switch the theme.
(For Japanese User) 管理バーにテーマメニューを追加します。 管理バー上でサイトテーマの変更・有効化が行えます。 テーマを変更するために管理画面に行く? 要がなくなります。

Switch theme on admin bar

This plugin adds Theme menus in the admin bar. You can switch and activate the theme on the admin bar.

Whodunit

Jb Audras

This plugins provides custom admin bar colors to differentiate environments (staging, preprod, production). It’s really easy to use and developer-friendly.
The plugin provides a settings screen which several options:
<ul>
<li>choose between several color predefined schemes.</li>
<li>use a favicon to better differentiate your environments in your browser’s tabs.</li>
<li>add a custom message in your admin bar, like “Production website”, “staging version” or whatever your want.</li>
<li>choose the user roles that will see the color scheme (other roles will see the default admin bar).</li>
</ul>
It also offers few PHP constants you can use in your <code>wp-config.php</code> file (see Frequently Asked Questions below).
Since WordPress Core will probably deprecate alternate admin color schemes in mid-term, this plugin is meant to be use by those who rely on colors to know is they are in staging, preproduction or production environment.
Last but not least, all provided color schemes are accessibility-ready!

Contextual Adminbar Color

OMG this is what I need.
I actually use the alternate colors, but I don't like to change the good "blacky" interface ;)
So, this is the best option ever.
And since the alt colors will disappear (soon?), it's a good idea to use this to prevent wrong wabsite updates and tons of wasted hours trying to figure "why this is not updating? HO CRAP I AM ON THE PRODUCTION SITE *phone rings* "hey, client… well listen… you won't believe me ha ha ha :|"

This is what I need

Perfect plugin that allows me to easily differentiate my various environments.

THX !

Great !!!

Really enjoy this plugin.
It’s simple and well integrated with WordPress admin UI.

I really like the optional configuration through wp-config.php.
After configuring it once in wp-config.php, I won’t ever need to reconfigure because it doesn’t loose settings on importing settings (eg. staging <-> production).

Great job @audrasjb!

Simple and very usefull!

Such a great helper! It gives me the safety to know exactly which environment I work on without having to worry. 
Sometimes things look just alike in your DEV, STAGE and PROD environment. And with this little plugin, it is immediately obvious which environment you work in.
And it also works on WP 5.6 - just checked...

Makes my life much better knowing exactly where I am

Use custom admin bar colors and favicons to differentiate your environments (staging/prod)

Switch theme on admin bar vs Contextual Adminbar Color