・Utility
Absolute Enable Right Click & Copy
https://addons.mozilla.org/ja/firefox/addon/absolute-enable-right-click/
Flagfox
https://addons.mozilla.org/ja/firefox/addon/flagfox/
Dark Reader
https://addons.mozilla.org/ja/firefox/addon/darkreader/
Dark Background and Light Text
https://addons.mozilla.org/ja/firefox/addon/dark-background-light-text/
Link Gopher
https://addons.mozilla.org/ja/firefox/addon/link-gopher/

・Bookmarks Management & Sync
xBrowserSync
https://addons.mozilla.org/ja/firefox/addon/xbs/

・UserScript Manager
Tampermonkey
https://addons.mozilla.org/ja/firefox/addon/tampermonkey/

・Tampermonkey Script
Tampermonkey Script Summary Ver3 (for stockpiling)
https://pastebin.com/6i5JaHRg