Beginning 6/2/2026, attempting to post a picture/photo on Facebook fails when using Firefox.
I have cleared the browser and Facebook cache, Verified browser and AVG are up to date, restarted the browser after each step and have thoroughly verified AVG Web Shield is the source of the issue.
After reading past issues here, I found a suggestion to uncheck the AVG Web Shield Setting where QUIC/HTTP3 Scanning is enabled. For now, it appears that disabling that setting has resolved the issue.