It says "click the extension button" but there is none so it's nonfunctional. I've turned it on and off, restarted the browser, looked in hidden places, etc. (Firefox 149, MacOS 15.6.1 Sequoia)

跟safari的扩展完全一个天上一个地下……麻烦要做就好好做一下

It's a useful extension if you're on Mac and using Firefox. However it's buggy sometimes. For example in a web page with numbered list/headings it failed to capture the headings.