array.filter + scoping => performance problem in Firefox

[roman.bazelides]

Both array.filter and array.forEach allow for scope change.

array.filter(items, function(item) { ... }, this);
array.forEach(items, function(item) { ... }, this);

Whereas array.forEach scope change does not have any significant impact on performance, scope change in array.filter causes filtering operation to take twice as much time in Firefox as filtering without the scope change.

For more details run following ​jsFiddle in Firefox.