I switched to Tab ReTitle because it's far better.

With Tab Mix - Rename Tab, I can only rename the tab and then that's the name of the tab regardless of the URL. I can't assign URLs a tab title. I can do that with Tab ReTitle. That means every time I go to that URL, no matter how I go to it, the tab automatically gets my custom title. If I visit a different URL in that tab, the title changes as expected.

With Tab Mix - Rename Tab, it seems to always automatically name YouTube videos to just "YouTube" on the tab. With Tab ReTitle, it doesn't do this. It simply stays out of Firefox's way. So now I see YouTube video titles on the tabs thanks to switching to Tab ReTitle. This has nothing to do with any settings.

There are a few other instances where the title never showed the way I wanted it to show, and Tab Mix - Rename Tab couldn't help because it was just for that tab only and if I closed it, that was it, the title was gone. Going to other pages in that tab meant the title doesn't change because I had simply renamed that tab. With Tab ReTitle, everything is exactly as it should be, based on the setting I used when renaming the tab!

Therefore, Tab Mix - Rename Tab isn't any good.