Please add option to choose default as Random with a preset time range

[kilves76]

It's annoying to have to enter a time range for every page always again when restarting browser, would be nice if there were boxes at the configuration page for saving a default time range, and choosing that as the default instead of a fixed time.

And please make the random range boxes a bit larger, now they only show 3 numbers with default fonts (on Windows with 100% zoom), the UI could accommodate doubling them to 6 digits each.