I've noticed that, since yesterday, some of the Personas are not working. When I hover some of them (including a few that I've created myself), the theme will not appear on my Firefox, only the colors will. I'm not really sure what to do about it.
Are you using the default theme?
To find out, go to Firefox > Add-ons or Tools > Add-ons, then go to the Appearance tab on the left. If the "Default" theme doesn't have a button to enable it, then that is what you are using.
Check for problems with an extension or theme:
Note that you need an allow exception to make hover work.
You can check the HTTP response headers with the Live Http Headers extension to see if there are problems with retrieving the images.
The exception IS allowed. Like I said, it's only not showing some of the Personas, not all. One of the ones that wasn't working (as in it was not showing up as my theme when I hovered over it or chose it as my theme) finally worked for some reason, but some others still aren't showing up. (Just a note: the thumbnails for the themes are showing up okay.)
Like I wrote a few replies earlier, you can use the Live Http Headers extension to check the requests made by Firefox if you hover an image and check the response headers received from the server (e.g. content-length) to see if the images were retrieved successfully.
i think i have the same problem too but different in some areas...what i mean is I think there's nothing wrong with the personas... it will install instantly but when it's installed in my firefox it's kinda small... just the upper portion has the image and then the lower portion just plain color...and i don't really know what to do about it. so i just stop using personas for a while but I'm really trying to have that again because it's cool to have personas. I've tried so hard that i even read a lot of questions here and try to do things that i think might be helpful like refreshing or restarting my firefox but all my hard work are still not paid of...please help me with this. I want to use Personas again so badly. I really need a reply as soon as possible.