If you reach this limit, you may request a limit increase. There is no such limit on the number of themes. Note: You cannot have more than 20 extensions published on the Chrome Web Store. Once you've uploaded your extension, you will see it as an item in the dashboard. If your item's manifest and ZIP file are valid, you can edit your item on the next page. Click Choose file > your zip file > Upload.Use the following steps to upload your item: After registering your developer account, setting it up, and preparing your extension follow the steps in this article to publish your extension for the first time.