I've thought further about this, and have a more generalised tab-based (rather than window-based) suggestion:Have the option to tag any FF tab with one alphanumeric tag. For example the tag "SOCIAL".As soon as a tab is tagged, it moves automatically ...
There are already some (imperfect) alternatives which may help:FF's feature of typing "%[SPACE][search term]" in the address bar will find tabs containing the search term. E.g. "% mini" finds my tabs related to classic mini's. Mostly. A bit klunky bu...