When you download any web browser setup file, they are usually online installers. To install the browser in multiple systems, you may opt for the offline setup package (offline installer). Here are the full download links for Google Chrome, Mozilla Firefox and Opera browsers.
Google Chrome
Google Chrome 32-bit (x86) Offline Installer (Single user account)
Google Chrome 32-bit (x86) Offline Installer (All user accounts)
Google Chrome 64-bit (x64) Offline Installer (Single user account)
Google Chrome 64-bit (x64) Offline Installer (All user accounts)
Opera
Download Opera offline setup file
Firefox
Download Firefox Offline Setup file
About the author
Ramesh Srinivasan founded Winhelponline.com back in 2005. He is passionate about Microsoft technologies and has a vast experience in the ITeS industry — delivering support for Microsoft's consumer products. He has been a Microsoft MVP [2003 to 2012] who contributes to various Windows support forums.