Rated 4 out of 5 stars
Good add-on but it could be great.
As mentioned several other times:
1. I would really like to be able to choose a shorter interval time of around 15-30s
2. It needs a popup notification option
3. An adjustable sized preview window would be nice
4. The ability to choose where the preview window pops up would be nice too (for instance it could take place of the previous window and expand it to the chosen size or it could be displayed in the center of the screen with the desired size)