Can you move this string to its own js file (something like `libraries.js`)?
Maybe use something like [xhr](https://github.com/tildeio/ember-extension/blob/master/app/adapters/chrome.js#L36-L38) to fetch the script's text (will probably need to add it to `web_accessible_resources` in `manifest.json`). 

I would also add this file to the [jshint list](https://github.com/tildeio/ember-extension/blob/master/tasks/options/jshint.js).