So now I do not really want to focus on Intention of changing Proxies, but my intention is to give you proper guidance on How to change Address of IP in Mozilla Browser without using any software.
I recommend you to buy the proxies from buyproxies.
Previously I Explained How to Change IP Address Manually on Google Chrome Mac.
How to change IP address on Internet Explorer?
Change IP Address on Mozilla Browser
Step #1) Open Mozilla Firefox
Step #2) At the right corner of Mozilla Browser, click the menu , the three horizantal lines as shown in the Image Below.
Step #3) Now click to options tab, a new tab will get opened.
Step #4) Advanced > Network > Connection > Settings
Step #5) Now Select Manual Proxy Configuration and enter your New IP Address and the port Number.
You can Also change the IP’s Address on Internet Explorer