In my mind this a convenient approach for developers to map the code into a two dimensional space in a spread-out way. It is similar to method of loci[1] that the develpoper spacially elaborately encode the code snippets and their connections to strengthen the memory thus strengthen the comprehension. I boldly suggest considering ading an option for a background pattern which is not distracting but a little bit informative. I don't have a specific one in mind but consider if the background is a world map, users will remember the location they want to find faster and also locate themselves faster.
Following this line of thought, I think allowing user to define tab border color or even to add different noise for each tab worth considering (noise fades with zoom level and distance to the view port center).