Safari is no longer a supported browser
Apple has implemented a change in how they handle Safari extensions. Previously, a Safari user could simply download an extension and use it in their browser. Now Apple is requiring users to download and install a Mac App to get the extension.
Major browsers such as Google Chrome, Microsoft Edge and Mozilla Firefox were all adopting a standard commonly known as "WebExtensions". This provides a single API across all browsers, which is hugely beneficial as you can develop for all major browsers from a single code base. Safari is not adopting this standard and instead moving to their own format, with a strong reliance on Xcode.
This would require significant investment from our team to support these changes. Unfortunately, we don't have the time and resources to concentrate on it for now. This is why we put Safari support on hold and do not guarantee a stable work of our previous extension versions in this browser.