Drag and Drop Upload is a very useful extension for Firefox that lets you drop files from Explorer or Finder onto a file upload box. W00t! No more clicking the browse button! This is one of the small everyday improvements to your normal workflow that saves a little bit of time and makes life easier for you while you work.
Firefox has so many extensions whose functionality used to require installing completely separate applications on your computer or going to a website that offered the same functionality. A drag-and-drop file upload for Firefox probably won’t enable you to retire sooner but it will definitely save a little time.