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I have Windows Vista Home Premium 32 bit - which version of Firefox is compatible with it?

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I need a version of Firefox that is compatible with my OS - Windows Vista Home Premium 32 bit. Please provide specific information if available so I can minimize problems with my OS.

I need a version of Firefox that is compatible with my OS - Windows Vista Home Premium 32 bit. Please provide specific information if available so I can minimize problems with my OS.

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See this Knowledge Base page: https://support.mozilla.org/en-US/kb/get-latest-version-firefox-windows-xp-vista

On Vista you need KB2763674 from Microsoft to install Firefox 43.0.2 or later. But you can install 43.0.1 and update it immediately via Help > About Firefox.