PolylineGlowMaterial rendering on ubuntu 12.04 and firefox 46

See the following screenshot:


The blue line is thicker than expected (compare with http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Polyline.html&label=Geometries). Could you point me in the right direction to further dig into this issue?

Start by reproducing the PolylineGlowMaterial rendering on Ubuntu 12.04 with Firefox 46, then compare the line thickness with the Cesium Sandcastle Polyline example linked in the issue. Inspect the PolylineGlowMaterial rendering path and use the screenshot as the visual reference; done means the blue line has the expected thickness in the reported environment.

Written by the indexing model from the issue text.