best of its kind Rated 4 out of 5 stars
I tried a few different extensions that perform the same function--clearing out text in the search and address bars to allow for an easy middle-click paste into the desired field. I give preference to Xclear because it (1) it works, (2) its simple and to the point: nothing extraneous, and (3) it emphasized being a lightweight add-on.
One suggestion I might offer to improve the add-on in the future would be to make it capable of clearing the entry field by rolling the middle button up or down when placed over the field to be cleared. This would elimate the extra movement and mouseclick, thereby making the app more convient and ultimately more enjoyable.
Implemented in 1.7
Very good idea (mouse wheel), I implemented it in 1.7