in re: my previous comment: I started a profiler before bookmarking my last set of tabs, and it looks like there may be a conflict with the extension "Vertical Tabs", which took 40 seconds of scripting time out of the ~50 minutes the bookmarking took.
Too bad ... The browser is seems pretty good so far except for this one problem. I like the fact it blocks ad's and the vpn features. Casting though is a big thing for many of us cord cutters here in the US. I did try changing the Local State file as mentioned from anther post and that didn't work .