Hi thanks for your feedback.
An update was just published in the last few days. Can you test now and see if the hide watched is working? It seems like it’s working OK for me.
A lot was updated in this version, like Automatic video ad skip by default.
For scrolling, the options would be persistent on a per-website basis except when in Incognito mode, it gets cleared as soon as the browser closes. So, when you open an Incognito window, turn off scrollers right away, and it should stay off in all new tabs on that website until the browser is closed and reopened.
I will think about changing the default to off so that the UX is the other way around, but using wide-screen automatically turns off scrollers, and if you’re not looking at thumbs in the sidebar, why not go widescreen? Then they won’t be on anyway.
That said, we are working on an update that will provide an options panel where you can control the default. In that case you’ll be all set when that’s released, hopefully in the next 30 days, but maybe 60 days depending on how things go.
Note: Firefox is still a manual install/update. Chrome is automatic.