How can i set custom user agent？

[fmpoffice]

I want to change custom user agent

[Atavic]

random-agent-spoofer uses profiles, not just a user agent string.

[fmpoffice]

I can't find “useragents.json” at “C:\Users\Administrator\AppData\Roaming\Mozilla\Firefox\Profiles\7k2ic9wm.sel” and “C:\Program Files (x86)\Mozilla Firefox”？

I'm using selenium webdriver ,I want to make a direct change custom user agent，AND I tried to fix it “C:\Users\Administrator\AppData\Roaming\Mozilla\Firefox\Profiles\7k2ic9wm.sel\prefs.js” Unsuccessful user_pref("extensions.agentSpoof.whiteListAcceptEncoding", "gzip, deflate"); user_pref("extensions.agentSpoof.whiteListAcceptLanguage", "en-US,en;q=0.5"); user_pref("extensions.agentSpoof.whiteListAppCodeName", "Mozilla"); user_pref("extensions.agentSpoof.whiteListAppName", "Netscape"); user_pref("extensions.agentSpoof.whiteListAppVersion", "5.0 (Windows)"); user_pref("extensions.agentSpoof.whiteListDisabled", false); user_pref("extensions.agentSpoof.whiteListOsCpu", "Windows NT 6.2; Win32"); user_pref("extensions.agentSpoof.whiteListPlatform", "Win32"); user_pref("extensions.agentSpoof.whiteListUserAgent", "Mozilla/5.0 (Windows NT 6.2; rv:50.0) Gecko/20100101 Firefox/50.0"); thanks ! I has been resolved

[thesilent33]

How did you resolve that?