hi youngsavta, yes firefox will continue to support windows vista systems. you'll want to download the regular 32bit version of firefox, which runs fine on your 64bit operating system as well from www.mozilla.org/firefox

How to install Firefox on Windows

On Vista you need to make sure that KB 2763674 is installed, to allow Firefox 43.0.2 and later versions to be installed. Otherwise, you need to install the olde 43.0.1 version first and then allow Firefox to update to the latest version.

See this KB article - How can I get the latest version of Firefox on Windows XP or Vista?

Might be one of the reasons that Chrome is dropping support for Vista.

Note that only the Shockwave Flash plugin and Silverlight plugins are enabled for 64 bit Firefox versions for Windows. If you need to use other plugins like Java or media players then you need to install the 32 bit Firefox release.

• http://www.ghacks.net/2015/11/25/firefox-64-bit-to-support-microsoft-silverlight-after-all/

EDIT: From:

• https://www.mozilla.org/en-US/firefox/44.0.2/system-requirements/

Please note that 64-bit builds of Firefox are only supported on Windows 7 and higher.