Works good most of the time.

Not bad

It does not save files which contains ".Net" in title

Just simply works!!!

It only allows me to download 3 videos per day, which seems insufficient to me.

What user who're having problems, there is a procedure you'll have to follow:
1) www.yourvideofile.org/support.html
2) Click on "Get Temporary Fix"
3) Follow the instructions and you should be good to go.

Extension is pretty good, but doesn't work for many YouTube videos.

It's a robust extension that should be usable forever after a single worked, but sometimes (perhaps for videos longer than 5 minutes), downloaded content can lose a segment of its beginning.

Its a well working program.