Firefox sometime ctrl+tab switching tabs stuck- title shows of selected tab, still preview of previous tab

Firefox sometime ctrl+tab switching tabs stuck- title shows of selected tab, still preview of previous tab.
When i alt+tab 2x to another and back window, then ctrl+tab switching works again.
Why i happens sometimes like that?

I’ve seen this issue as well. Often closing out windows/tabs (blindly) resolves it but not always.

Well closing isnt option since working in tab still. I get over that by switching windows and then works again.
Now how to have this bug fixed.

I always suspected it was a problem with not enough RAM. Did you try to increase the available RAM in the qube?

I’ve experienced something similar to this in the past, though only in fedora appvms. Typically occurs when I’m doing something resource demanding in the browser (e.g. watching a 1080p video). Messing with the memory alloc didn’t seem to have much of an effect. What fixed it for me was switching to a debian based template and using firefox in there instead.

Don’t know why exactly this is, but I assume it has to do with missing video/audio codecs in fedora. Don’t quote me on this though.