Extremely helpful and versatile Rated 5 out of 5 stars

I use Tile Tabs all the time, but typically only activate it to view two tabs side-by-side (left/right). I most commonly accomplish this with F12 because I don't like using the drop-down menus. If I have numerous tabs open and I do not want to change their order, I use the "shift-drag" mouse function. To tile tabs that are not next to each other, simply do the following:
1. view one of the tabs you want tiled
2. hold "shift"
3. drag the tab you want tiled over the window of the tab you're currently viewing - an icon (labeled "Above," "Right," "Left," or "Below") will appear to the left of the cursor depending on where the cursor is on the window

Thanks for writing this extension!

This review is for a previous version of the add-on (10.1.1-signed).  This user has a previous review of this add-on.

More information please

As well as using the drop-down menus and F12, you can also create a layout by clicking on the toolbar button, or by double-clicking on any tab, or using the Arrow-Key shortcuts, or using Shift+Drag on any tab.

In standard Firefox, there is not a mouse shortcut which overrides Tile Tabs' Shift+Drag shortcut. The article you referenced makes no mention of Shift+Drag. Even if there was, you can change the Tile Tabs shortcut to be any combination of Shift/Ctrl/Alt + Drag.

It is not clear what you mean by "tabs which are separated" - please explain in more detail (email to: dw-dev@gmx.com).