For aesthetics reasons (I know this affects accessibility) I want to remove the outline
in some buttons, but in Firefox 17.0.1 I can't seem to find a way to do it.
I tried the answers in this popular question but none of them worked.
Here's a jsfiddle with an example of the buttons, http://jsfiddle.net/t54JE/ when you click the buttons you can see the outline (using Firefox 17 of course).
or maybe this is a bug with FF? they don't want us to remove the outline?
The following CSS from the question you linked works perfectly:
.btn:focus {
outline: none;
}
See the following JSFiddle for the CSS in action: http://jsfiddle.net/t54JE/12/