Firefox “AI chat” tab is not available on some PCs

Firefox user here..

Recently FF rolled out a great new feature, which looks as a vertical side bar, pinned to the left side of the main window; in it I seem to have some extension icons, but most importantly, the “AI Chatbot” mode. I have other laptop, Windows 11, where I also use Firefox, and I use Sync on both devices. But on that other laptop, I can’t seem to find a way to activate this “left-pad” window

Is there a way to do that manually or somehow troubleshoot why would not it be there on that PC? Both PCs use latest versions of FF, which is 134 at the moment of writing for me