I have got http://www.perftesting.co.uk/ajax-truclient-protocol-tips-and-tricks/2012/04/23/ where I can block pop up on firefox but in same kind of operation in intermediate pop-up I need to click clear, print, details like buttons inside in firefox so this problem is partially solved
Disable pop-ups during recording –
Unwanted pop-ups during script development create hurdles. If you want to disable the pop-ups, you can do it by following the below mentioned steps –
1. In the firefox address bar, enter ‘about:config’. Click ‘I’ll be careful, I promise’ tab.
2. In the filter field, enter disable_open_during_load.
3. Right click on ‘disable_ open_during_load’ and select ‘Toggle’. The value changes to ‘false’.
4. Record initial Navigation step again.
I also added one more thing to remove cookies and cache regarding getting useful link: http://www.linkedin.com/groups/Function-listing-LoadRunner-AJAX-TrueClient-2960998.S.41556483