My in house security team, recently suggested that Firefox be marked for automatic updates. I did so reluctantly and within three weeks, my feelings were confirmed. I logged in and hit the firefox button. Not found. OK, where did they move it? Program Files. OK. I opened Firefox. No configuration, no passwords, and no bookmarks. The help to restore previous bookmarks does not work, presumably because the file was deleted with everything else in Program Files (x86)/Mozilla Firefox. You should not force an update that will cause the user to lose work -- never, ever. If you're going to move the installation directory, the user should get a chance to backup first. I did not get that chance and I've lost work. Further, I've lost confidence in your product. I can no longer recommend Firefox to others as I've done for decades. This is not a good day for you and your product.