I ve found on other forums that I'm not the only one having this problem with uploading, so lucky you, I've found a solution! I've tried downloading new version of Adobe Flash - didn't help, worked with anti-virus - didn't help either. So I just tried "Reseting Firefox to its default state", because that should fix the unlisted problems, and it did. It's all good now, I can upload files again. :) Thanks for your support, Diego Victor :)

Here's a link on how to Reset your Firefox: https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems

PS. It might have been a problem with my add-ons (but I'm not sure), since I had to do download new ones when the FF upgraded. So you might check those out first before reserting to default state.

Modified January 6, 2015 at 9:47:30 AM PST by gintarecer

Shoble, I too seek answers before I post a question, and none I found, including yours, resolved my problem. I've "refreshed" Firefox repeated, started in Safe mode repeatedly, and checked to assure Pop-Up Blocker was not checked repeatedly....but still no help. The problem obviously lies within Firefox, because eBay support has no problems uploading pictures to revise my listings; I have no problem uploading pics from the eBay Turbo-Lister program; and I have no problems when using my iPhone. REALLY need help on this one!!! Michael

It is possible that security software (anti-virus, firewall) is causing the problem. Try to disable security software temporarily to see if that makes a difference.

I turned off my Vipre Antivirus software but it did not make any difference.....still cannot revise ebay listing photos.