How to Change UA of Firefox without any Add On

 Yesterday I decided to download Mobile Rediff. It is a rediffmail client and can also backup contacts to its server. I want to keep every app that I download for later use. In my Nokia 2730 classic, default browser is Opera Mini. So I was unable to download it as the UA differs. Also I need the JAD file to get the signed app. UC Browser is always a better option as it can use phone's UA. I had to download the JAD file, then open it with a text editor to get the URL of the JAR file. I tried to go to rediff's mobile site to download the app. But it showed my phone is not supported. And It was not possible to download it in PC.

But I wanted to have the app. So I changed the UA of Mozilla Firefox to that of Nokia 5130xm and now I could easily download the app. So here I describe how.

• Open Mozilla Firefox, then type about:config in the address bar.
  
  
• You will see a warning that this can void your warranty(Firefox has a warranty???), click I'll be carefull, I promise.
  
  
• Then you will see a page with lots of strings and values.
  
  
• Right click anywhere and select New>String
  
  
• Then a box will appear. Enter general.useragent.override
  
  
• Click Ok and now enter desired UA. You can find a list of UA of various browsers in a previous post.
  
  
• Now you are done.
  
  
• To reset the UA to default, again go to the about:config page.
  
  
• In the searchbar, search for general.useragent.override.
  
  
• Then right click the string and select Reset.
  
  

This is extremely useful when a site only opens in a specific browser and you want to open it in firefox.