I just tried it for the first time... it didn't work. After I select the element I want to hide and check mark one, a few, or all elements listed under "Require attributes" and click "Add element hiding rule", the divider comes back.
My laptop is still hiding the date dividers and when I open the blockable items window, there are a couple of differences for hidden elements compared to my desktop:
My laptop lists:
##.list-view-item-date-label
##div#msg-list.list-view.ml-bg:not(.list-view-item-container)
Instead of those two, my desktop lists: ##.mb-list-ad
Version of Firefox on laptop is 41.0, Desktop's is 41.0.1
Any suggestions?? I'm going crazy!
