I use yahoo mail (not the classic version), and just installed their yahoomailuploader (0.5) to allow for attaching multiple files at once, etc. which as I understand it installs yahoo's browser plus. Everything about this new option seems to work fine... except I cannot see the attachment preview image. I get a status bar saying the image is being attached, and I see the "check" icon that says the file's been attached, and the "X" to delete the attachment and even the rotate-image icon... but no tiny image! I'm just trying to attach jpegs I have stored on my hard drive.
The only thing that seems to allow the image to show up is disabling NS (1.9.8.86) entirely. Enabling NS and allowing scripts globally still prevents the image from showing up. I can enable ALL my extensions except for NS... and the image shows up, so apparently none of my other extensions are contributing to the problem, at least. (I do have AdBlockPlus installed, but it's currently disabled.)
Both yahoo.com and yimg.com are allowed. I tried allowing 216.xxx.yyy.zzz, which didn't fix things... Also, the image in question is associated with http://localhost:XXXXX, where XXXXX is a random 5-digit number that usually starts with a 5. (Have I demonstrated how ignorant I am yet?

Site LOCAL
Accept from LOCAL
Deny
which I sort of understand from looking at the "What's ABE?" page, but I'm not feeling brave enough to monkey around with without feedback!
Hope all that tells you something useful... any ideas? I'm not sure if this is a yahoo thing, a firefox thing, or an NS thing, honestly, though I'm guessing it's not Firefox's issue. Thanks in advance for any help...