Create a log for premium caches on geocaching.com
With this extension you will see an icon in the omnibar (address bar) that redirects you to the log form for this cache.
If you're not a Premium Member on geocaching.com but you find a premium-only cache, logging is not that easy. Either you use fieldnotes, when you're lucky enough and get the cache on your GPSr (that supports fieldnotes) OR you just use this extension that will show a link to the log form.
Note paper from https://www.iconfinder.com/icons/101829/note_paper_icon
Star from https://www.iconfinder.com/icons/115793/star_icon#size=128