This is actually really nice! While I don't have a lot of tabs open at once, dragging my mouse over and clicking is really tedious. Even though the Firefox address bar allows you to switch to already open tabs, it's still not seamless. This is great for noticing the name at a glance and switching quickly.

Thank you! Super glad you liked it.

Note that the URL bar already has a similar feature.

Ctrl + L, %, <search for tab name>

Yeah, but it never worked for me. For some reason it lists only a fraction of my open tabs. Also my extension allows me to jump faster between tabs using their tab number, and easily close tabs by prepending a zero to their number.