Hello, thank for your feedback. You are right, I didn't handle the case of long filename, I will fix this ASAP.
But for your extension problem, I couldn't reproduce it. I get all the images name and extension whithout problem. Does it happen on a specific sub ? (/a/, /wp/, etc) Could you provide an exemple of "google(number)" ?

EDIT: Filenames has been fixed in v1.0.2
EDIT2: I didn't see your feedback for the "spoiler image", it is now fixed (1 year later...) For 4chanX, I have to take the time to test on my side and make a possible fix. Thank again for your precious feedback