title: How to change save image to file default name?
body: <p>I have a canvas HTML5 tag that is created by Caman.js.</p>
  
  <p>When I click right in FF and save to file the default name for the file is canvas.png. Since I create a lot of files and need to save them this is unfortunate, because I need to set the different name for each.</p>
  
  <p>What I would like to accomplish is that when saving first image save to file dialog shows firstfile.png and second secondfile.png and so on. So I don't need to change the name in the save dialog window.</p>
  
  <p>How to change the default name of save to file dialog in FF using HTML and JS?</p>