Imaris
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I can't get used to the new Firefox; I keep refreshing the tab instead of opening a new one.
Yesterday, I reinstalled Firefox because it was glitching; I downloaded the latest version from the official website. I didn't notice any changes in the design or anything else.
Unless you're talking about the transition from 3.6 to 4.
Added 5 minutes later
In general, this Firefox is glitchy. It often freezes and lags, and yesterday, Contact wasn't working in it, or rather, it was working incorrectly: buttons weren't clickable, messages weren't sent, the chat didn't work, videos couldn't be watched, etc.
I googled the problem, and they say you need to create a new profile to fix it. I googled what a profile is in Firefox, and it turns out that a new profile is a completely clean Firefox, without cache, passwords, extensions, history, settings, etc.
It's better to just reinstall it, lol.