I like it because it is not confusing like the one that comes with Linux in that you move the magnifier with the mouse instead of moving portions of text around inside the magnifier which can cause you to lose your place. But I would change two things, which would be a wider rectangle view for reading longer line widths and fix so it wouldn't disable when scrolling down the page using the mouse wheel.

I wish there was an option to remove the mouse pointer from the capture area

Very nice for what it does, but I sure would prefer the option of a rectangular or square shape.

A great add-on, I would love to use it, but I am not a fan of the circular lens. The circle is an inefficient shape for maximizing screen space. The vast majority of my time using tools like this are to read long lines of text, or to magnify images/videos that by design are stored as rectangles. If there was an option to be able to set a customizable square-rectangular lens this add-on would be PERFECT! It would earn the 5 stars it deserves.

Also honorable mention to keyboard shortcuts for finely adjusting the zoom level on the fly.