Rated 5 out of 5 stars

per KMel T el oct. 22, 2017 ·

This is perfect!

This review is for a previous version of the add-on (1.4). 

per Realraven (Axel Grude) (desenvolupador) a oct. 23, 2017 ·

... because it will not work from Firefox 57 - they will deprecatee all XUL based addons (and this is not possible with web extensions). Only Workaround: switch to Firefox ESR release or Pale Moon.