XF 1.5 ID of tab

The have classes, rather than IDs.

upload_2015-9-7_11-41-36.webp

Note the class name after the navTab class in each li, e.g. home, forums, xengallery, resources, etc.
 
I've just said something similar in your bug report. Basically the tab system identifies tabs internally with a unique ID. We just happen to print this ID out into the list of classes applied to the tab.
 
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