Czuch Czuckers: I at one time loaded many different extensions since there are a lot of "cool" ones out there - but found out I never used most of them, and probable would not use most of them - so I uninstalled all but 2.
Forecastfox - nice weather related extension - I keep the 5 day forcast in the bottom bar of my browser - A lot of times I only want a quick outlook - like about what tempature it will be this week, or if it looks like rain, and I use this a lot for just quick looks at stuff. (for more details, I use some weather websites & not forecastfox - but I think it can give you more details also - I just already have a couple sites I look at for the details.
BugMeNot - As a tech guy, I visit many sites for things like tips, computer problems, drivers, etc... Some of those sites make you register before you can view answers, or download drivers. Well for sites I know I will probable never visit again, I envoke the BugMeNot - which will 85% of the time log me onto these sites long enough for me to get what I want and leave - without having to register & get on their mailing lists.