I have a problem since some time, Firefox stopped interpreting the transparency in my game. In the navigation, I have a png, which is overlayed by a transparent pixel (x.gif)
These are the original files:
- https://spacetrace.org/pics/navigation/buttons/production.png
- https://spacetrace.org/pics/navigation/buttons/search.png
- https://spacetrace.org/pics/x.gif
And they work in all browsers, except the latest Firefox on Android (a few weeks ago, Firefox on Android worked too).
This is how it looks now: 
for example the production.png image is with white background now, while the search.png works fine with transparency
I already tried to compare the output of imagemagic's identify -verbose production.png with search.png but I found no clue, this is the diff output:
Image: production.png | Image: search.png
Geometry: 39x39+0+0 | Geometry: 40x39+0+0
Pixels: 1521 | Pixels: 1560
mean: 100.691 (0.394867) | mean: 114.719 (0.449879)
standard deviation: 84.552 (0.331576) | standard deviation: 92.5997 (0.363136)
kurtosis: -0.86307 | kurtosis: -1.20889
skewness: 0.600582 | skewness: 0.428943
entropy: 0.626761 | entropy: 0.640743
mean: 199.804 (0.783545) | mean: 195.449 (0.766466)
standard deviation: 100.551 (0.394318) | standard deviation: 103.445 (0.405669)
kurtosis: 0.00158551 | kurtosis: -0.316896
skewness: -1.38079 | skewness: -1.26072
entropy: 0.263538 | entropy: 0.263553
Colors: 320 | Colors: 316
...
Page geometry: 39x39+0+0 | Page geometry: 40x39+0+0
png:IHDR.width,height: 39, 39 | png:IHDR.width,height: 40, 39
signature: 9995b265a15a8c420fb52a3a2394c1 | signature: 55dfc1232b6f0d2684c3ff47e78cfc
filename: production.png | filename: search.png
Filesize: 1386B | Filesize: 1406B
Number pixels: 1521 | Number pixels: 1560
from Why do some png images show their transparency as white in Firefox
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