Seems pretty handy. So far the extension works pretty well.

In testing out the Firefox version of the extension, I found that it would be nice if there were a "copy to clipboard" button near the "Subscribe" button for users who just want the RSS URL. I host a FreshRSS instance so the "Subscribe" button doesn't do anything for me. Triple-clicking the URL works to highlight it all, but a single-click copy button would be a nice QoL improvement.