Apps, Extensions and scripts cannot be added from this website

Instead of opening the file, you have to: extract it (crx are zip files), then visit chrome://extensions, enable developer mode, and load unpacked extension.

The reason for this is: lots of people try to abuse chrome apps/extensions to install nasty applications to your browser. So Chrome tries to make it impossible to automatically side-load these apps without you making sure that is really what you want to do.

So.. typical caveats of installing software apply when using this approach.

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