easyCalc

There's some problem with history... it won't save it anymore for some reason...

Best calculator extension. Use copy paste, check. You can use number pad, check.Results on the fly, check. Doesn't go to a separate tab, check. Simple and clean. Five starts!

Best simple calculator extension/app I've found. Always there - no messing! It did stop working after a month or so (probably due to system restore) so I just removed it and then re-added it, and it's good again :) I recommend this for convenience and simplicity. Great!

Less is more , :-) nice app

great except when you're dividing. try this: 5+5 enter /2 enter

Simple and great.

Good! small text box does all these these!! Liked the expression save functionality. Anyway, graphically, the extension has to be improved.