Hey. Just read the description, these are API limitations:
>The addon does not work on https://addons.mozilla.org, pure svg pages and internal pages like about:newtab, about:addons or other addon option pages.

------ or in your language:
> 這個附加元件無法執行於 https://addons.mozilla.org、純SVG頁面、 Firefox的內建頁面 (諸如新分頁、附加元件 、設定等等)