I posted the following question on Stack Overflow Meta.

http://meta.stackoverflow.com/questions/186618/how-to-easily-unindent-a-block-of-code/186621#186621

From this I was directed to the following question.

Better handling of indentation and the TAB key when editing posts_

I am trying to install the script mentioned in the post, I get the following error. I only browse on Chrome.

Apps, extensions and user scripts cannot be added from this website.

I have many browsers installed, but I only use them to check web pages I've created. So there is no point for me to try and install the script on these.

Is there another way I can get a script or similar extension for Chrome?