See bug:25899.

Choose the correct input method. Open the select element then type the first letter of one of the elements. The search prefix should be the first non English letter, not the value of the physical keyboard plus the native non English letter. For example, set the input method as Hebrew, hit keyboard 'c', the translated Hebrew character is 'ב'. The search prefix should be 'ב', not "cב". And the right element should be selected.

Hebrew Select:
Russian Select: