Hello,

Why do you want to install an older version of Firefox??

we already have Firefox 29 out there.

please update your Firefox to be safe from security threats and to get improved performance.

see:

Update Firefox to the latest release

Hi Aman,

Actually I don't want the latest version, because it doesn't work well when I use a tool to open it. Firefox 25 Chinese version is fine for me, and I want firefox 25 English version, can you send me a download url?

Thanks, Amity

Here you are : ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/25.0/win32/en-US/Firefox%20Setup%2025.0.exe

Thank you, Kam!

You can install a portable (ESR) Firefox version to access websites that do not work with the current Firefox release.

The portable version comes with its own profile folder and doesn't interfere with the currently installed release version.

• http://portableapps.com/apps/internet/firefox_portable
• http://portableapps.com/apps/internet/firefox-portable-esr

• http://sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C%20Portable%20Ed./

• http://www.freesmug.org/portableapps:firefox#toc1
• http://sourceforge.net/projects/osxportableapps/files/Portable%20Firefox%20OS%20X/

• http://portableapps.com/support/firefox_portable#helper_apps

Could someone give me a URL for a Mac version? I need Firefox 25 to run the Firefox OS Simulator 4.0.1. It's the only way I've found to connect my ZTE Open (OS v1.1) and test apps. The App Manager only works with OS v1.2. Thanks.

Did you try the current Firefox 24.6.0 release for Mac as that version is safer than the Firefox 25 release?

All Firefox releases:

• http://download.cdn.mozilla.net/pub/mozilla.org/firefox/releases/
• http://download.cdn.mozilla.net/pub/mozilla.org/firefox/releases/24.6.0esr/

See this article about how to install multiple versions on Mac OS X:

• http://www.businessinsider.com/how-to-run-firefox-4-and-3-simultaneously-in-mac-os-x-with-multiple-firefox-profiles-2011-3