It does not work on the only website that I am interested into: archive.org.
Anyway I would never install it in my main browser, because it can see all my passwords and other things that I write.

See:

https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

"The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords."

Firefox for Android 9.0 install this plugin ，the touch support is missing,please check it,thanks!
在安卓9.0系统中的火狐浏览器安装fvd插件，触摸功能不起作用，请开发人员检查下，谢谢！

This app is MADDENING! Every couple of minutes my downloads stop and I have to start them going again.