extension's viewport is not large enough / not scrollable

[DaveLampton]

I'm using Chrome Version 56.0.2924.87

When I open the extension and click the "Decoded" tab, the data extends down past the bottom of the viewable area, and there is no vertical scrollbar, so I cannot see everything.

When on the "Encoded" tab, the data extends past the right side of the viewable area, and while there IS a horizontal scrollbar, it's a PITA to have to use it constantly in order to see everything.

The extension's viewport should either be resizable, or at the very least, should provide both horizontal and vertical scrollbars.