I have tried reinstalling Mozilla, safe mode, disabling hardware hardware acceleration in Mozilla and flash, deleting profiles and other information, allowing Mozilla through a firewall and other things too. These sites work fine in IE and chrome. They also work in Mozilla until i try and enter filter/form information. Eg on these airline sites once i select destinations and dates and try to enter or find flights it loads 'The connection was reset' page. http://www.qantas.com.au/travel/airlines/home/au/en http://www.jetstar.com/au/en/home ( Where as Tigerair and Virgin work fine. http://www.tigerair.com/au/en/ https://www.virginaustralia.com/au/en/ ) It has happened to many other sites too, always when i try to filter results. Another example http://www.seek.com.au/ 'I can use the site completely fine, but when i try and change any settings to narrow down a search or not, it loads 'The connection was reset' page when i search.