MARKIE205  I'm going to reply to my own question in the hope that the developer will see this.

Without those two features - a) a back navigation button and b) a way to interrupt a download - Get Tube is almost useless. If these features are included, I don't see them. There are two arrow buttons at the bottom of the window, but they seem to do nothing.

For some reason, the developer has completely rewritten this app,starting with one that was very useful, then morphing to one that was missing a useful feature (i.e., the ability to batch download), then to this mini-browser which doesn't work very well.

Every so often, each version of the app suddenly fails. I'm assuming that this has to do with some change made by YouTube to thwart downloads. The developer eventually catches up to YouTube, but why he feels compelled to re-write the entire app is curious.

I would gladly pay money for this app if it worked properly and remained consistent.

Please, this is not a rant at the developer, just a comment about a very useful concept that seems to miss the mark.  
(Version 4.01)

MARKIE205  Useful app, but...

1. Is there a back button as in an Internet browser?

2. Is there a way to stop or cancel a download?  
(Version 4.01)

MARKIE205  The previous version of Get Tube had a shopping cart. This version does not, unless I don't see it. That was a very convenient feature.  
(Version 3.0)