Can I use Speedster if my store contains custom Javascript files?

There is no problem using Fooman Speedster with your custom Javascript as long as it conforms to standard Javascript coding.

We suggest testing all Javascript files which are not part of the Magento base/default theme on jslint.com for code quality. If there any existing Javascript errors are identified on your site, ensure these are completely fixed before installing Fooman Speedster.

Fooman Speedster relies on all Javascript on your store being completely error free. If your store contains existing Javascript errors, these will be magnified when installing Speedster and could cause issues with your store's frontend.