Hmm, I did notice a change to how this dialog works, and it seems to open the window first and then populate in the content. I have attached a screenshot comparison.

Are you using a full theme or extension that creates the sidebar-based Page Info dialog? Perhaps the add-on needs to be updated to work with this new design. Or maybe this was solved by now?

It looks like this is a problem with the All-in-One Sidebar extension. There are discussions here:

https://github.com/AddonLab/AiOS/issues/93 https://github.com/AddonLab/AiOS/issues/94

jscher2000 said

Hmm, I did notice a change to how this dialog works, and it seems to open the window first and then populate in the content. I have attached a screenshot comparison. Are you using a full theme or extension that creates the sidebar-based Page Info dialog? Perhaps the add-on needs to be updated to work with this new design. Or maybe this was solved by now?

I used that option much before and it is a whole tab that is missing. There was a second tab called Media which contained all images, swf, mp4 and their links. I have All-in-One sidebar but this is not its feature but Mozilla's, I used it before to have this extension. I don't go to it through AIO but with right-click on a page and choosing View Page Info. I'll disable the extension to try without it and will write again.

Yes, indeed, it is AIO bug. I'll activate it again but when needing View Page Info will disable. Thank you for the help!