A professional and personal must have add-on Rated 5 out of 5 stars
I use Awesome Screenshot Plus - Capture, Annotate & More mostly for business. I capture images and comments for blogging ideas, future resourcing, communicating with website clients for design, and personal information relevant to finance, social, and family.
This add-on is easy to use and 100% dependable in previous and current FF 31 versions. I use it 10+ times a day.