When I read content on a web page, I like to use the up and down arrows and PgUp PgDn to go through it. I hate having to reach over for the mouse and line everything up to go to the next screen. Since the last update, it seems I can't do that. When I hit the down arrow, or the PgDn key, it skips randomly down the page. This is especially true if I am reading an article with pictures in it. I think this might have something to do with my clicking yes to an inquiry from Firefox that just appeared on the page while I was browsing. It asked whether I wanted to be able to block text with keyboard commands. I'd like to change it back to whatever it was before, but can't figure out how to do that. Bill