For new contributors, it's not obvious what the differences are between the various different trees exposed in MXR. Since there are many deep links into MXR, users (such as myself) can never see the tree descriptions available at mxr.mozilla.org. It would be better if the "view using tree" caption for the tree-selection dropdown was a link to the tree descriptions. It might also be useful to add a short warning pointing out that the tree names are not all self-evident.
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