First grab the add-on for Firefox called ‘user agent’ here and install it. Now go to Tools > User Agent Switcher > Options and then again to Options
Select User Agent from the left sidebar and click Add. Now in the description field type:
crawl-66-249-66-1.googlebot.com
and in user agent field type:
Googlebot/2.1 (+
)as shown in the screenshot below.
Select Google Bot as your User Script by going to Tools > User Agent Switcher
Now browse any website or forum without registering.






