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Firefox only gained that ability very recently in FF73 (https://bugzilla.mozilla.org/show_bug.cgi?id=202251 https://bugzilla.mozilla.org/show_bug.cgi?id=202251)
by iggldiggl 6y ago
Firefox only gained that ability very recently in FF73 (https://bugzilla.mozilla.org/show_bug.cgi?id=202251 https://bugzilla.mozilla.org/show_bug.cgi?id=202251), hence it's not yet in the current ESR. It does seem to have a toggle for turning it on/off, though.
Normalisation and - except for the soft-hyphen - ignoring of ignorable whitespace characters (ZWNJ, ZWJ, WJ etc.) on the other hand are still missing in Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=640856 https://bugzilla.mozilla.org/show_bug.cgi?id=640856).