PDF files uploaded to Commons, English Wikisource, and English Wikipedia (and presumably other projects) in the last day or so fail to display thumbnails. Tested in the latest versions of Firefox and Vivaldi.
For example, see [[File:Special 301 Report 2014.pdf]]
* In the ProofreadPage extension, [[Index:Special 301 Report 2014.pdf]], the images of the pages are not displayed.
* On the File page itself [[:File:Special 301 Report 2014.pdf]]) the pages are displayed as empty.
* Additionally to viewing the file, if trying to see alternative resolutions (any from ''Other resolutions: 185 × 240 pixels | 371 × 480 pixels | 464 × 600 pixels | 593 × 768 pixels | 1,275 × 1,650 pixels.''), strange errors are displayed, for example:
<pre>Error generating thumbnail
Error creating thumbnail: Reading profile /etc/firejail/mediawiki-converters.profile Reading profile /etc/firejail/mediawiki-converters.profile �]0;firejail /usr/bin/convert -depth 8 -quality 95 -resize 185 - /tmp/transform_efeb80e7e64d.jpg �convert: no decode delegate for this image format `' @ error/constitute.c/ReadImage/501. convert: no images defined `/tmp/transform_efeb80e7e64d.jpg' @ error/convert.c/ConvertImageCommand/3210. Parent pid 48742, child pid 48744 Parent is shutting down, bye... </pre>