Stop those damn "file doesn't exist" errors.
Don't maintain a back/forward list for the web view.

This (I think) allows us to keep the <video> element’s right click menu
active rather than simply showing “reload.”
Basic plumbing for an icon visibility preference.

A :cookie: for @chrisdrackett.
Implement the toggling of dock/menubar icons.

You’re welcome @chrisdrackett / @mintchaos. :zap: