neptunetheme.com

The power of the plugin comes from the flexibility to select any element on your website to customize. Once the elements are added to the list, they will be instantly available in the Customize with a set of settings that allows you to customize everything.
With Neptune Style Element, you can customize everything of your WordPress website with no coding knowledge!
<h3>Features</h3>
<ul>
<li>**Find element by mouse simple to customize it.</li>
<li>Supports 800+ Google Fonts!</li>
<li>Live preview with Customizer: Smooth integration with WordPress Customizer to give you preview the changes in real-time.</li>
<li>Optimized for performance & SEO: The plugin is well coded and optimized for the best website loading speed. Enjoy the beautiful look and high SEO score!</li>
<li>Works with any theme: Made for users, Neptune Style Element works with any theme. No conflicts, no extra setup. Just install and enjoy!</li>
<li>Automatically enqueues all stylesheets for your chosen google fonts.</li>
<li>Developer & User friendly: The plugin is easy to use and easy to integrate into themes if theme authors want to have font options for their users.</li>
</ul>

Neptune Style Element

Stable tag: 1.0 License: GPLv2 or later Customize any element with support for live preview in the Customizer.

SwiftNinjaPro

This plugin blocks non-admin users from using inspect element, while still allowing access those with manage_options permission. 
The plugin also blocks some of the common keys(f12, ect.) and optionally can block right-clicks for non-admin users. 
Admins are unaffected by the plugin entirely. This plugin is also able to block users who open developer tools on another site, before visiting your site.
Version 3.0 update
This plugin is now fast and accurate, and should work on most browsers. 
This plugin can detect the browser console based on lag increased by opening the console. This detection is tough for a browser to prevent or get around. 
The detection runs fast, and has some resistance to lag spikes.
Lag detection does mean your site needs to have ok performance, but when testing it, I could play 10 of 10 youtube videos all at once without a false positive. 
During my tests, detection was still within the second I open dev tools, and successful if I go to the page with it already open. 
I tested this in chrome, firefox, and chromium. 
I also tested this on my somewhat slow website with tons of wordpress plugins installed (and the 10 videos at once test) without false positives.

Developer Tools Blocker

This plugin blocks non-admin users from using inspect element, while still allowing access those with manage_options permission.

Neptune Style Element vs Developer Tools Blocker