Idea is about option to move selected (on menu accessible by right click on tab) tab to selected window (item in submenu).
On Linux, we have Virtual Desktop and Activities (Plasma5). Virtual Desktop and Activities can have name, like entertainment, work, school, homework, etc. I can open page in new tab and next need to move it onto window on another virtual desktop/activity.
I know you will tell I had to open new window in another Virtual Desktop or Activity and open page in that window. I think someone might need only to check something (read article related to job, when she/he is in home) and next decide to create something about related to job and open article, so open another activity/virtual desktop, open new Firefox window and move related to job article to this new window.
The idea also implies way to set window name. This idea is also useful without Virtual Desktop and Activities, because moving tabs around windows currently force to use D&D and not anybody can do that.