Rated 5 out of 5 stars
I've been using this one for years, and as far as I'm concerned, Firefox is broken until it's installed! I wish it was available for Chrome as well.
It's a bit fiddly configuring it to my liking, but once it's done it's great. I use it constantly, god knows how many times per day.
I wish I could figure out how to add custom icons to services though. One service I create is for IMDb, but I can't figure out how to make it show an IMDb icon. But it's no big deal.
Well done to the developer, please keep this one going!