I have created a new calendar extension for Chrome which uses Javascript to show you the current Jewish calendar, not as an overlay, but in a custom, easily read view which you can customize as you want.

Like the standard version, this extension works without internet access, and it doesn’t track you in any way, it stores information locally in your browser, and there are no ads or third-party cookies.

How to get this calendar?

For Chrome users, you need to make sure that you have "Enable JavaScript" and "Always allow notifications" turned on.

Download this app for free, open it, and you’ll be able to see the current Jewish calendar without an internet connection.