Unlike XUL, extensions are just passengers, with no power to override core browser engine features. I don't think that web extensions have reached a similar lev

Unlike XUL, extensions are just passengers, with no power to override core browser engine features. I don't think that web extensions have reached a similar level of usefulness today. And even if they did, why should we have waited so many years to gain that functionality back? Google's decision to have crippled extensions was made in a corporate board room to maximize Google's leverage at the expense of utility for users. So it is tragic and baffling to see Mozilla pantomiming what Google did, since throwing away a far more mature and powerful extension framework benefits nobody but Google. Google could troll Mozilla by just announcing that they are deprecating local bookmarks (and they may very well do that), and watch as Firefox obsequiously removes bookmarks from Firefox, "to stay modern", and then Google could pull the rug out from under then by not deprecating it.