By request from Linus Torvalds (https://plus.google.com/102150693225130002912/posts/7PsYYeavcA9) heres an extension to disable F12 from opening the developer console in Chrome/Chromium. The screenshot clearly shows that there is no developer console even after pressing F12. ;)
You can Follow the below Step By Step procedure to install the Disable F12 Chrome Extension to your Chrome Web browser.
It is the Disable F12 Chrome extension download link you can download and install Chrome Browser.
Global shortcuts working everywhere (including outside of Chrome if you wish).
Chrome extension to disable numpad on youtube to prevent accidental video skips
Shows the time (hours and minutes) next to the omnibox.
Disable arbitrary 'key'board shortcuts
Easily inject javascript libraries from the console
Customize 'key'board shortcuts and hot'key's, Mouse gestures, Wheel gestures, Rocker gestures, Bookmark shortcuts, Joystick actions.
To use, type 'go' into the search bar.
Prevents Ctrl + Scroll zoom
Customisable hot'key's for basic browser actions.