Today I was updating one of my userscripts, but when I went to test my changes in Chrome, I saw the following warning:

Chrome Userscript / Extension Warning Message

The learn more link took me to this page:


Following the directions for OSX, I tried adding the ExtensionInstallSources preference via the command line:


defaults write com.google.Chrome ExtensionInstallSources -array "https://github.com/skratchdot/*"

Chrome Canary:

defaults write com.google.Chrome.canary ExtensionInstallSources -array "https://github.com/skratchdot/*"

I restarted Chrome, and still could not install my userscript.

After reading through this bug:


I found the --enable-easy-off-store-extension-install switch. By using that, I was able to start Chrome from the command line to install my userscript.


/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --enable-easy-off-store-extension-install

Chrome Canary:

/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --enable-easy-off-store-extension-install

It would be nice if the "Tools"->"Extensions" page (aka chrome://chrome/extensions/) had a list of whitelist/blacklist URLs that you could edit. That page allows you to enter "Developer Mode", so it makes sense to have a few more options there.


This workaround exists as well:

  1. Download the user script.
  2. Open chrome://chrome/extensions/.
  3. Drag and drop the user script file on the page you opened in step 2.
Tagged with: UserscriptChrome