Comment by robryk

These hex strings are beginnings of md5 checksums of these files:

   sh-4.3$ md5sum error.33ab1eb5.svg 
   33ab1eb5129ee5085793166d2f691dae  error.33ab1eb5.svg

I believe the point of appending them to the name is a kind of versioning: one'd want to be able to change these files and cause everyone to drop their cached version. This way when one changes a file, the filename changes too (most likely), so the cached old version will not be used.