Calixte Denizet 7dda85654e [UI] Avoid to have buttons in hover state after having been clicked (bug 836732)
- it aims to fix https://bugzilla.mozilla.org/show_bug.cgi?id=836732;
 - replace :focus by :focus-visible for the buttons in the UI, according to the docs:
   - https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible
   - the button has the focus-visible state when it has been focused with the keyboard
2022-01-30 18:11:34 +01:00
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