To modify IE's UserAgent, you must edit the registry. "HKEY_CURRENT_USER" Software "Microsoft" Windows "CurrentVersion" Internet Settings "5.0" User Agent "Post Platform" "HKEY_LOCAL_MACHINE" SOFTWARE "Microsoft" Windows "CurrentVersion" Internet Settings "User Agent" Post platform "" HKEY_LOCAL_MACHINE "SOFTWARE" Microsoft "Windows" CurrentVersion "Internet Settings" 5.0 "User Agent" Post Platform "if you want to change IE's UserAgent to FireFox, you can do this: Change the default value of UserAgent to "Firefox" and create a new character under Post Platform. String Value "Firefox" = "". Note that you need to restart IE after modification. In FireFox, enter "about: config" in the address bar and press enter to enter the settings menu. Find "general. useragent. override". If this item does not exist, right-click "new"-> "string" and enter this string. Set the value to the UserAgent you want. In the Maxthon toolbar, choose "Tools"> "Travel settings Center"> "advanced options", select "Custom UserAgent string", and enter your UserAgent. Save the settings and restart Maxthon. Chrome Method 1: add the parameter "-user-agent =" Your UserAgent "at startup ". Method 2: Modify chrome. dll. Change the UserAgent string to your own. On the Safari menu bar, choose Edit> Preferences> Advanced and check Show Develop menu in menu bar ". There will be an additional item "Develop" in the menu bar. You can set your UserAgent through the "User Agent" sub-menu.