Apparently, clicking on "Publish" from the main dashboard will publish the extension with the previous settings (testers-only: yes/no).
Follow these steps to publish an item after having published it to testers:
- Unpublish the item.
- Click on the "Edit" link (
https://chrome.google.com/webstore/developer/edit/.....
) - Scroll down to the bottom.
- Click on "Publish changes" (the right-most button).
Now, your item will be publicly visible instead of testers-only (within a couple of minutes).