Review for Search for Sender by Doctor
Rated 5 out of 5 stars
It extension permit me to clean my big email account, just point the sender, click with the rigth mouse button and choose Search for this sender (of for this subject). Now the filter is active and I can cancel/move my selected message. Very fast.
I agree with another comment that the further step is add Search the same recipient.
To create your own collections, you must have a Mozilla Add-ons account.