Hi, TechHorse. You should see an option in your Firefox Settings (or about:preferences) to disable the Shift-Click option. I use middle-click to open new tabs, so it doesn't interfere for me. Other combinations, like Ctrl-Shift-Tab work fine with ...
For now, it looks like the Settings allows you to turn off AI features (either in Firefox settings or use the little gear that shows up in the Link Preview feature). The only difference, per my basic testing, is that you won't see an overview of the...
You're most welcome - I'm glad it worked, and I added the comment to the original post (apologies for the duplicate). Just a guess is that there might be some kind of roll-out hold based on Firefox extensions. I know that roll-outs are often staged...