This Thread - is a place to talk about some of your favorite add-ons, new ones you've found, and perhaps some you may be looking for. Have a neat tool thanks to an add-on? Have an add-on that helps stop annoying things, like Adblock? Post them!
When posting please try to do the following:
Give the official name of the add-on.
Give a link to it.
Be sure to say at least one or more Browsers the add-on is available for. (Firefox, Chrome, Safari, etc)
Give a quick description of what the add-on does or changes.
Add a pic or logo because 1.) it will make it easier to look for, and 2.) it just looks nice.
If the add-on might have several steps to use it, feel free to make a little mini-tutorial too.