Suggestion: get rid of the sidebar tabs #21
Description
The sidebar should be relatively narrow. With 3 tabs it's OK, provided the labels don't get too long, which can be a problem when localized.
When more tabs are added, tabs become unsuitable. And actually, there should already be 4 tabs: "Encode/Decode" is currently missing.
Suggestion: instead of tabs, put a pop-up menu labeled "Tool:" at the top of the sidebar.