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1. Install User Agent Switcher Addon in your firefox
2. Restart FireFox
3. Then Go to Extra > User Agent Switcher > Options.
4. Then Go to second tab “User Agents”
5. Then click Add
6. Then paste Following Code In It
   Description: Google Bot
   User Agent:
   Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
7. Then  Save it.
8. Then Go to Extra > User Agent Switcher and choose “Google Bot”