Found on evaluating MDL-26863 and then MDL-26880.
Note: FF correctly show the TOC and launch the item, even with the notices.
Patch proposal: https://github.com/scara/moodle/commit/36c0108a2f9f7ac6168598c3ec1d3d84bf25e9f0
Note: the above patch applies to vanilla Moodle code and not to a being MDL-26880 patched one. It should be dependent on that as this bug is dependent on MDL-26880: not sure if this is the right way to proceed in terms of Core Dev workflow.
Pull request submitted - thanks Matteo
Matteo, thanks for your report and patch and Dan, thanks for fixing it. The fix is included in the latest 2.0.2+.