>>637
Scroll To Topの代わり
Scroll To Top
https://addons.mozilla.org/ja/firefox/addon/scroll-to-top/
Scroll to Top
https://addons.mozilla.org/ja/firefox/addon/scroll-to-top-webext/
Scroll To Top Button
https://addons.mozilla.org/ja/firefox/addon/scroll-to-top-button-extension/
Top and Bottom scroll buttons
Go to Top of Page Button