OK, thanks! Now I know, where to start.

SOLVED In case anyone else has this problem, here's where I found what I needed. File: /nodebb/src/controllers/helpers.js Methods: buildCategoryBreadcrumbs and buildBreadcrumbs Editing those allowed me to get the behavior I was looking for. Although, I would be curious to know if there is a better way to do this without changing the source code.

Hmm. That might make sense, maybe on plugin activate it appends to end and on deactivate it removes it

@psychobunny good point.

Implemented in latest version of Lavender