You don't want to install or use Firefox 10 as it is vulnerable to dozens of known security holes, plus being unstable and slower than Firefox 18. Is there a problem you are trying to solve?

I have reasons, few software (licensed) which can only be run on 10.x.

Please let me know if there is any link.

There shouldnt be software that can only run on 10.

Thanks for your time Tyler.

But in simple words I need to download 10.x, can you or anyone help me downloading an older version?

It is easy enough to download and use Firefox 10, but it is not normally a very safe thing to do, unless for instance you are running it on a virtual machine. (ESR is no longer on Fx10, that is now Fx17).

If you wish to explain what you are trying we may come up with alternative methods you could use.

One thing that may help would be to use Fx18 for day to day work and Fx10 only for the development or legacy work you do. To do that either install the legacy Fx10 in another OS account.
Alternatively install the other version with it's own profile and dedicated shortcut so that you may use whichever you wish, or even have them both open at the same time. This is considered advanced and not fully documented here, but is not too difficult and is documented on mozillazine.

• http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
• http://kb.mozillazine.org/Testing_pre-release_versions#Installing_multiple_versions

Another and simpler still method would be to install Firefox Portable based on Firefox 10 IF you are able to find an old copy of it.

• portable: http://portableapps.com/apps/internet/firefox_portable

And for an official download of Firefox 10 follow the links contained in this article:

• Install an older version of Firefox
  • the esr version is the least out-dated, although it is not intended for use by individuals, and is still: outdated, insecure and unsupported. https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/10.0.12esr/

I am using https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/10.0.12esr/win32/ but I cant download version 10.x

Comment by John99
That was what I suggested. The ESR version is actually more up-to-date than the basic version ten as it was supported until a few weeks ago. The folders are for the different language versions. The hashes are available so that download file integrity may be validated.

Thanks I got it..

Edit _{by a moderator J99}
I have hidden the link to an unofficial download. It is always better to use downloads from Mozilla. There is a possibility of other sources being incorrect files, having unwanted software bundled, or even a risk of malware.

The link to the official website is contained within this document Install an older version of Firefox (If you need a copy and can not find it PM me or I am sure Tyler would help)

_{Because only a very low number of users will need such links, and they are to unsupported insecure versions I do not wish to repeatedly post the direct link in a google indexed forum}