You should be able to view the other devices and right click to open all the tabs. see screenshot You can also try downloading a different version of Firefox and see if you have the same issue. Make sure to install in a different directory than your current install. https://www.mozilla.org/en-US/firefox/channel/desktop/

@jonzn4SUSE - Thank you so much for your quick response!

Yours shows "Synced Tabs, and mine shows "Tabs from other devices" (see screen shot). I was using 146.0 on Windoze 11, and it's no different on 146.0.1, and the laptop in question is "managed" by corporate IT, so I cannot install another version. I am a little suspicious now that I'm doing something wrong, and there is some other place I should be, other than clicking on the sidebar button? Or more likely, when they changed the popup header they also broke the right-click menu?? Maybe I need to wait for a later update? In the almost 20 years I've been using FF (since v2, IIRC), this might be my first bug report.

You are using the that new sidebar thingy... See this screenshot to get to the same place.

Yeah, that takes me to exactly the same sidebar "Tabs from other devices" that I showed in the previous screenshot, where a right-click on a PC name (still) does nothing at all. So, is there an easiest way to report a bug?

You should see these options. see screenshot https://bugzilla.mozilla.org