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have mac os x 10.4.11, tried to upgrade to firefox 4.0, lost the previous firefox (3.6?), 4.0 doesn't work. now how do i get the previous firefox back?

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i have a mac os x 10.4.11, tried to upgrade my hole firefox (3.6, i think?) to the newer 4.0. get a message that it can't run on this computer (perhaps because it's an older mac?), but the 4.0 that i downloaded replaced the older version of firefox, and now i don't have firefox at all. how can i get the older version of firefox? i have an application from work that won't work unless i have firefox. i want to still be able to use firefox, as i always have. is there a site i can go to to download the old firefox? please help!

i have a mac os x 10.4.11, tried to upgrade my hole firefox (3.6, i think?) to the newer 4.0. get a message that it can't run on this computer (perhaps because it's an older mac?), but the 4.0 that i downloaded replaced the older version of firefox, and now i don't have firefox at all. how can i get the older version of firefox? i have an application from work that won't work unless i have firefox. i want to still be able to use firefox, as i always have. is there a site i can go to to download the old firefox? please help!

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Sorry about that, yes, 10.5 and 10.6 on Intel can run Firefox 4.

Here's the process to roll back:

First, I recommend backing up your Firefox settings in case something goes wrong. See Backing up your information. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)

Next, download and save Firefox 3.6 to your desktop for future installation. http://www.mozilla.com/firefox/all-older

You could install Firefox 3.6 over Firefox 4 (many have reported success) or you could uninstall Firefox first. If you uninstall, do not remove your personal data and settings, just the program.

Firefox 3.6 should pick up where you left off. If there are serious issues, please post back with details.

Note: I haven't actually tried this myself!