Rated 5 out of 5 stars
It is a very good idea but still has some issues. Files can not be opened in external programs and for me Toggle file thumbnails doesn't work. I am using it on windows 7 x32. I think also it will be more convenient to open the files with clicking on the file name.
Hopefully it will get improved.
Thank you for your feedback! The opening of files in external programs works in the native versionen von TagSpaces (http://tagspaces.org). The thumbnail issue is already fixed in 1.8.0, which is waiting to be reviewed by mozilla. The current implementation opens a file by double click on the filename.