Sounding graph, weather stations and save files broken on Firefox Linux.

[Cloudwalk9]

Only the lapse rate line seems to render.

Replacing

        if (wallTextureValues[4 * y + 1] != 0) { // if this is fluid cell

with

        if (temp < 599.0) {
          // not wall

seems to fix it. This is probably not a proper fix but it's a clue what might be going wrong.