I use the one that comes as part of Google Toolbar. You can have multiple profiles, which is handy, though it sometimes get mixed up with things like UK post codes and US zip codes. On the whole, it's pretty useful
My Computer
At a glance
Windows 7 Enterprise x64Intel i7 9206 GBnVidia GTX260 + nVidia 3D
it does it itself up to a point, for instance, if i type "S" into a username form it brings up "severedsolo" which is my username for nearly everywhere
My Computer
At a glance
Windows 10 Pro x64Intel Core i5 7400 @ 3.00GHz8GB 2133Mhz DDR4 (OEM supplied)Gygabyte Windforce GTX 1050Ti (Factory Overcl...
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Medion Erazer (note to self: insert model number) - with custom additions
i suggest that you not use one of the addons, and you disable all autofill features in firefox. in my book the security is more important than the time i would save.