Gnanasekaran Loganathan

Activation mail sent to the new user email once a user registered. The user must activate the account by click activation link in addition to a username and password to log in successfully the first time.
This plugin does not currently work with multi-site. Multi-site uses an activation key system for new registrations already.

User Activation By Email

Require users to click the activation link to access the site which is emailed upon user registration.

Milan Dinić

<a href="https://milandinic.com/wordpress/plugins/admin-bar-plugin-switcher/" rel="nofollow ugc">Plugin homepage</a> | <a href="https://milandinic.com/" rel="nofollow ugc">Plugin author</a> | <a href="https://milandinic.com/donate/" rel="nofollow ugc">Donate</a>
This plugin adds a menu in admin bar that enables toggling of activation status of plugins. It can be helpful to developers who want to quickly see something before and after plugin is activated.
Note that it has no settings, just activate it and it works immediately for any user that has permission to activate/deactivate plugins. Also note that it is not multisite compatible.
And it’s on <a href="https://github.com/dimadin/admin-bar-plugin-switcher" rel="nofollow ugc">GitHub</a>.

Admin Bar Plugin Switcher

Activate/deactivate plugins from admin bar.

User Activation By Email vs Admin Bar Plugin Switcher