Thanks for Fennec-QML 0.0.1, it is better than Firefox v0.15-0.17 in some aspects. E.g., for IPython Notebook use on MeeGo Harmattan :
"Fennec-QML (using IPCLiteAPI) v0.0.1 shows promise : renders MathJax, doesn't zoom in/out automatically like Firefox, perfect use of keyboard (vkb or Bluetooth) so vkb arrows and shift+enter are ok, Bluetooth keyboard with all woking shortcuts. But it is unstable (closes sometimes), has problem scrolling long notebooks (only vertical arrows of Bluetooth keyboard work) and can't select "New Notebook" or "Cell" type."

Maybe the new releases will solve the above issues, so Fennec-QML will be the best web browser for IPython Notebook use.