The origin of this question is that I've tried to find a way to override the behaviour of Firefox which removes the close tab button of unfocused tabs as the number of tabs rises, with no luck.
My issue is that Firefox removes the button to close a tab when the tab bar amount rises to (in my environment) 14 tabs and above.
This is a behaviour that, as far as I'm concerned, is a violation both to consistency and shortcut accessibility, both listed in Schneiderman's Eight Golden Rules, leading to a compromising of the overall UX of the application.
To strengthen my case I have Chrome as a reference which doesn't have that behaviour.
And in my meaning this is the appropriate way, and that Firefox in their approach are violating a number of usability rules.
I see Mozilla's reasoning behind it, they fear users will get annoyed if they accidentally close a tab that they intend to focus. However, is this enough of a big reason to violate consistency and shortcut pattern?
EDIT: dnbrv informed me that Opera uses the same approach as Firefox. And as I took a look at Internet Explorer I saw that they don't use shortcuts at all for tabs that aren't focused. I guess that works in a consistency aspect but it's terrible for shortcut accessibility. Another reason to add to the heap of why I chose not to use ie.