You can change a preference:

1. type about:config in the URL/Location/Address bar and press the Enter key
2. if you see a warning, accept it (promise to be careful)
3. Filter = browser.tabs.animate
4. in the lower panel you will see the value is true which is the default
5. double click on browser.tabs.animate in the lower panel to toggle the value to false
6. close the tab with about:config window

See:

• http://kb.mozillazine.org/About:config

Thank you. BTW when I saw the warning and the "I'll be careful I promise" I literally laughed out loud. I love programmers with a sense of humor!

Lol, FrogSteaks, I've always found that amusing as well… And sense of humour is always awesome. Nothing beats PunyVid (video converter, formerly known as iSquint), if there was an error, the two options in the dialogue box were "Denial" and "Acceptance". And then if you clicked on Preferences there was a message that said "Don't! You'll screw everything up!" And if you cancelled a conversion, a dialogue box said, "Oh well. It was fun while it lasted", and the button you had to click said "Nostalgia". XD Brilliant.

FrogSteaks

So that other users can find answers that have worked, please take a couple of minutes to return to the forum, sign in and click "Solved" next to the answer that solved your problem. Thanks.