Dear developers of Tile Tabs and Tile Tabs WE, I totally get it's not your fault that this extension cannot provide the SAME functionality like the old one, just the closest resemblance you could get to, and that it is not you but WE that is just not capable of providing it.

It IS however your fault, to make a decision that a window should be opened for me, which basically tells me "Tile Tabs won't work but Tile Tabs WE will", without proper notice that Tile Tabs WE will NOT provide the same functionality. Let's be clear here - that thing you call "Tile Tabs WE" is just a totally different add-on, and to me it's basically "Tile Tabs" with the core feature - tiling tabs - removed and replaced by something everyone could already do - tiling windows.

Which for me (and apparently many others) defeats the whole purpose of having an add-on anyway. I can already comfortably tile real windows without an add-on, and that was the only reason I've been using "Tile Tabs" anyway. I don't want your overcomplicated grid management with grids in grids in grids, or synchronized scroll, and whatnot. All I cared about was the feature that I could double click on a tab to have two pages next to each other in one window.

If that's impossible anyway, I can also just drag the tab down a bit and have the same result without another add-on, you know...

To be honest, I think it would be only fair if you changed the whole marketing behind this:
1) On the Tile Tabs add-on page, announce that Tile Tabs will retire due to Mozilla moving on to WE, which will render it incompatible as of November 2017.
2) Rename this add-on into "Tile Windows", since that's what it does; it does NOT tile tabs, it tiles windows.
3) Add a reference to this "Tile Windows" add-on on the "Tile Tabs" page, along with a clear message stating that this add-on is just a compromise trying to offer all the other functionality BUT the tiled tabs and instead tiles windows.
4) And finally, in the very first sentence of this add-on description (and I mean literally the first sentence, before the first heading, preferable in uppercase), be VERY CLEAR about how this add-on unfortunately CANNOT emulate the old "Tile Tabs" behaviour because of WE restrictions, but tries to find a compromise.

This add-on gets a 1* rating, not because it's bad per se, but because it is just not what you are telling us users it was. This is NOT, and I repeat, NOT a "Tile Tabs" alike add-on. It's something completely different. Rename the add-on and make the difference very clear in the beginning of this add-ons description, then we can talk again. Until then, bad marketing decisions that lead to vague add-on descriptions and false hopes, leave unsatisfied users like me hardly any other choice than giving it bad reviews.