Don't get me wrong, I'm not against Firefox improving and evolving. And I really don't care if Firefox is or isn't using XUL. As a user, that's quite irrelevan

Don't get me wrong, I'm not against Firefox improving and evolving. And I really don't care if Firefox is or isn't using XUL. As a user, that's quite irrelevant to me. However, as a user of Firefox, I am weary about being put in a position where the extensions I depend on no longer work, and either I don't have any recourse (if what the extensions do is no longer permitted or possible) or the recourse involves a large expenditure of effort on my part (rewriting my own private extensions). The friction of using Firefox has been steadily increasing over time for me. At this point, it's only the Firefox-specific extensions I use that keep me from switching to an alternative browser. I know I'm not alone. Many in the Firefox community already went through the broken extension experience back around Firefox 5 and we are not eager to go through that again. If Firefox users do experience problems with these upcoming extension changes, then I fear it will be the last straw for many of us. And if there's one thing that Firefox and Mozilla really can't afford right now it's to lose more users. There are very few of us, relatively speaking, as it is.