I use this addon to login to multiple social accounts. Very good addon.

But once enabled this addon, the desktop notification no matter from inside or outside the container would not showing the pictures through proxy. Yes, I use firefox's proxy setting and visit matrix element chat sites. (Firefox 94.0.2 x64, Windows 10 Pro, this Addon 8.0.2). Downgrade this addon to 7.4.0, no this problem.