What do you want?
- As my summary itself if self explanatory, the feature I have in mind is to add a 
parent tab for similar tabs. Basically, a tree hierarchical structure.

For instance, I have a search query to know something about implementation of JQuery. I can find a solution to this in websites like StackOverflow, StackExchange, TutorialsPoint and so. Along with searching about JQuery, I have another query to search in JavaScript in the same websites as mentioned above. At this point of time, I have 2 pairs of the above 3 websites making tab count as 6. It will be tedious if I have to classify which tab belongs to JavaScript and which tab is for JQuery. Since there will be 2 stackoverflow websites, 2 tutorial points and so.

To resolve the confusion, my idea is to introduce a parent tab which includes the respective child tabs. 
I mean, if parent tab's name is JQuery - it will have child tabs as StackOverflow, StackExchange, TutorialsPoint and so.
When the second parent tab is JavaScript - it will again have the respective child tabs.

Now, if even I have dozen's of tabs in active - if I want to get back to JQuery's search result in stackoverflow, I can get back with less hassles and more accuracy.

One more example can be, we can tag all video streaming websites into one parent tab optionally named as VIDEO's and all music streamers into one parent tab named MUSIC and so.



Why do you want it?
- I have ran into this situation when I was searching for some doubt in Java and C. Every time I wanted to open stackoverflow page containing JAVA's result, I ended up opening page that has C. Then, I tried to resolve the confusion by opening a specific browser for JAVA and C respectively. Later, I realized that I even can do this in one browser in place of two, if we have a parent tab - CATEGORIZER.
 

Deleted: Categorizer - Feature.pdf 351 KB

Categorizer - Feature.pdf 351 KB Download