Essential for my job. Fireshot has been the best solution for taking full page screenshots and saving them as either an image or a PDF. I often have to make PDFs of the classes I build and Fireshot is the only tool I've found that makes that happen. It's easy to use and works flawlessly.
I started using about 3 weeks ago. I use both chrome and firefox. I utilize evernote in chrome. It's great but everything is stored in their cloud. Fireshot (utilized in firefox) gives you the ability to place it on the hard drive. The only down issue is that you can only sync to microsoft one note.