How to change Firefox theme after installation?

I'm using Windows Vista, and I don't know what the cause of this is, but sometimes at random my theme switches to Classic.

Does anyone know how I can use an old theme on google chrome that I already added before then later changed and now want to c...

How do I change my email from uk to usa. I was given uk but I live in the usa

What do I have to do to change the parental settings on my computer so I can set up another email account? How do I change it?

can I install 16x slot in my laptop somehow...for graphic card??

Can you change your username on youtube?? How?

When is the right time to change the antivirus, because I have this antivirus but is only for one month, if I buy the norton ...

you know how when you open the internet how do you change the homepage?1 thx:]

Can I change my aol screename without signing up for a new screename?

I have adobe CS2 and I installed but it was in some African language... I uninstalled t and was wondering how I can change th...