Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Can i have 2 versions of Firefox on my Mac at the same time?

  • 4 replies
  • 3 have this problem
  • 1 view
  • Last reply by user780837

Frank Hall
Frank Hall
more options

I currently have Mac OS-10.6.8. I currently use Firefox 30. However, my new financial company specifies FireFox 18 to use its website. Thus, can I use both versions on the same Mac. Thanks for any advice that can be provided.

I currently have Mac OS-10.6.8. I currently use Firefox 30. However, my new financial company specifies FireFox 18 to use its website. Thus, can I use both versions on the same Mac. Thanks for any advice that can be provided.

Chosen solution

I have 2 versions of Firefox on my windows computer because I don't like the new versions. I have V30 in programs (86) and V 28 in a private folder. To do that I had to do a custom install of 28 and send it to my folder or it would have gone in programs or insist that I upgrade.

Read this answer in context 👍 1

All Replies (4)

Diego Victor
Diego Victor
more options

Use a portable versions of Firefox 18, isnt recommended use older versions of Firefox because they have security issues.

James
James
  • Top 25 Contributor
  • Moderator
more options

Diego Victor, your answer would be fine if fhall02 was using Windows and not Mac OSX. ______ You could try doing separate program folder installs and then making sure the Firefox 18.0 is using its own Profile as it should not really be shared between versions as far a part as 18.0 and 30.0.

Another alternative is you could try fooling this outdated browser sniffing the financial company site is doing by making the Firefox 30.0 useragent appear as Firefox 18.0 with an useragent extension like https://addons.mozilla.org/en-US/firefox/addon/user-agent-overrider/

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:18.0) Gecko/20100101 Firefox/18.0

Modified by James

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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

user780837
user780837
more options

Chosen Solution

I have 2 versions of Firefox on my windows computer because I don't like the new versions. I have V30 in programs (86) and V 28 in a private folder. To do that I had to do a custom install of 28 and send it to my folder or it would have gone in programs or insist that I upgrade.