This is SOOOO CLOSE to what I've been looking for. And that is to have categorised windows. For example 'social media', 'development', 'devops', 'home', .... and to get any new window that opens to land in the correct one of these. Currently the allocation is manual and theoretically once setup it wouldn't be much work at all. Setup works in TMP, excepting it is NOT PERSISTED. The tabs will remain together but the newly added titles do not stay. Once Markus adds a few more features on top of the *fixed version* of this plugin we will be well on the way to utopia. At that time my 4 stars will become 5.

New Features I'd desire to see include:
1. Keyboard shortcut to enter the 'search' input (Oo I found it - Shift-CMD-M by default on Mac)
2. Auto-assignment to categoriesed windows of newly opened URL. Initially can be simply based on pattern matching or base URLs. Work up to baysian learning, or based on other people's classifications.

Other Issues
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1. 26.11.20 - One month later. Tonight either TMP or FireFox or another Addon (but i've never seen this happen before installing TMP), nearly every tab from every window moved to the one window. It left 1 or 2 tabs behind in each window. Pretty annoying as I purposely organise the tabs into windows.