''locking as a duplicate - /questions/887078#answer-261172'' I used to use Firefox 3.6 and have just upgraded to version 7.0.1 (Pale Moon build, that shouldn't actually affect anything). There's a really annoying issue that I'm noticing and I can't figure out how to disable it. I can only describe it as an animated scrolling tab-bar. I have about 35 tabs open at any given time, so obviously the screen is over-filled with them and they won't all show at once. That's not a problem, that's why I can scroll through them myself! Well, say I'm on the far left of my tabs. If I open a new tab, or even click on a link that opens in a new tab, it will open in the far right (as I want it to), but it shows the entire tab bar scrolling over to the right, which takes a good 2-3 seconds with the huge number of tabs I keep open. Then when I close that tab, it scrolls all the way back. I do remember Firefox 3 doing the same thing, I believe it was called smooth scrolling? At the time I was able to figure it out, there was something in about:config I had to modify. I can't find this option with FF7 anymore. I tried disabling the tab animation, but from what I've read, that only prevents it from "growing" the tab from scratch, which doesn't really happen if the screen's already filled anyway. Even if I'm on the far right tab and open a new one, the new tab "appears" as an animation, from the far right of the screen and shifts into place. That's cool and all for those who like fancy graphics, but I'm using a web browser here, not a movie player. It's just obnoxious when I have to watch the animations move around when I have large numbers of tabs open. Can somebody help me disable this setting? If I install the addon "Tab Mix Plus", the issue goes away... however, that program does all sorts of other weird stuff like make my tabs all in italics and in red color. I'd rather not use an addon to fix what seems like a simple solution if I don't have to.