With Firefox loosing the ability to 'Save As' to the file system, eg: Downloads, Documents, etc. Firefox Nightly seemed the must have browser, as it retained this valuable function that so many people have also tried to encourage Mozilla to restore. 'Save As' has now been removed from Nightly. Without an easy way to export from it's erm 'Collections' of your interests or restore 'Save As' & perhaps turns off grouping tabs as a default. Maybe Mozilla's present motives need extra consideration?