Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1pre) Gecko/20090611 Shiretoko/3.5pre ID:20090611030802 When you select the "Select all" entry inside the context menu of web pages all images and text get selected except the canvas element. Copying the selecting and pasting into an editor doesn't list the canvas element too. I would expect too see the canvas element selected and when pasting the selection into an editor we should show something like "Canvas Image". Steps: 1. Open a web page, e.g. https://developer.mozilla.org/samples/canvas-tutorial/3_2_canvas_drawimage.html 2. Open the context menu and click on "Select All" 3. Copy and paste the selection into an editor

I imagine this is caused by bug 294852.

With the patch on buhg 294852 backed-out locally the canvas element is selected but using c&p doesn't copy it to the clipboard.

Yes, ideally, you want canvas to behave similarly as the <img> element, but the patch for bug 294852 made canvas not as annoyingly simple to select.

Retested on Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.4pre) Gecko/20090904 Shiretoko/3.5.4pre (.NET CLR 3.5.30729). The canvas elements does not paste in the editor. However on using "Select all" on the web page, the first canvas image does not select at all.

Reproducible Version 47.0.1 Build ID 20160623154057 User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:47.0) Gecko/20100101 Firefox/47.0