I've identified one significant problem using this add-on. That problem is that this add-on opens in a new window. It should simply open in a new tab, if it has to open a new anything at all. When an add-on opens a new window, if the user closes out the prior window with all his tabs, leaving the read aloud window open, it risks the danger of the user's prior session being wiped out, with all his tabs going with it, and when the user invokes Firefox again, all he gets is the window opened by read aloud. Unfortunately, my experience is that add-ons which claim to record and purportedly allow the reloading of prior sessions, meaning a set of tabs, simply do not work reliably when a new window has been opened.