Firefox incorrectly displays a PNG file
Please go to https://commons.wikimedia.org/wiki/File:Mediawiki_bug_(jdx).png, click on the screenshot and see it in full resolution. Black section headers (or parts of) are "shattered", while blue are displayed as expected. Tested under Firefox 47.0.1, QupZilla 2.0.2 and ancient IE 8.0 – all three show the image in the same way. Programs such as MS Paint or IrfanView show it correctly.
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That image works fine for me.
Does that also happen in Tools > Page Info > Media ?
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
Tools > Options > Advanced > Network > Cached Web Content: "Clear Now" "Remove Cookies" from sites causing problems:
Tools > Options > Privacy > Cookies: "Show Cookies" See also;
https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes Try to rename (or delete) the content-prefs.sqlite file in the Firefox Profile Folder.
http://kb.mozillazine.org/Profile_folder_-_Firefox You can use this button to go to the Firefox profile folder:
Help > Troubleshooting Information > Profile Directory: Show Folde
Yes, it happens also in Tools > Page Info > Media – e.g. header "Wish for your next edits" is "shredded"/"shattered". I have the same effect on other PC with Vista and Firefox 45.0.2 (and also IE 9.0).