Rated 5 out of 5 stars

Great add-on, I use it all the time! One feature request: When turned on, I'd like the option to have the lyrics auto expand to the bottom of the page or remember the size I set. Thanks!

This review is for a previous version of the add-on (3.12). 

The addon saves the panel position and *maximum height*.
If you want the lyrics to expand to the bottom of the page, simply resize the lyrics panel (via the gripper in the bottom-left corner) until the panel's bottom is at the bottom of the page.
When lyrics are loaded after that, the panel will automatically take up as much vertical space as needed to fit the lyrics in the page: If the lyrics consist of only a few lines, then the panel will be small and not reach the bottom. But if the lyrics take up a lot of space, the panel will expand to the bottom of the page (and show a scrollbar inside the panel to show the rest of the lyrics on demand).