Step 1: Open your Firefox and go to Add-on screen.
Step 2: Search for “USER AGENT SWITCHER” , If you can’t able to find the addon, You just go to this link https://addons.mozilla.org/en-US/firefox/addon/user-agent-switcher/ and Install the Add on and Restart the Firefox.
Step 3: After Installing, check User Agent Switcher button is available in Navigation bar, if not Just Right Click on the Navigation bar and Click customize and drag & drop the User Agent Switcher add-on to the Navigation bar.
Step 4: Click the User Agent Switcher Button in the Navigation bar and Choose INTERNET EXPLORER 7.
