Fortrikka Why do you think it should do that?
Vlad Bookmarking should not take up the entire page as it becomes quite difficult to see through the whitened page to see the content you are bookmarking.
Fortrikka What if the user does not have bookmark button on the toolbar?
Vlad It should then be underneath the address bar, like a popup like what happens with reader mode.
Or the "boookmarks" button itself can be embedded within the address bar. Chrome embeds it within the address bar.