I just upgraded to Firefox 4 and when I try to open it I get a message Cannot use with this version of OS X. How do I go back to the old version?

Question says it all.

Thank you. BUT, I've been downloading since noon. Download speed is 1KB/s, and it says that I have 2 hrs, 25 minutes, no, 2 hrs 27 minutes, wait, 2 hrs 28 minutes (and growing) to go.
I hope the Mozilla folks post a system requirements warning, next time.

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I just upgraded to Yosemite. Now when I try to open one particular document in Excel, I get a message that there's not enough memory. I can open other documents. The document I can't get to is the spreadsheet of my passwords. Go figure. When I check the storage under "about this Mac" it says I have 150 GB of 249 GB. I have a MacBook Air. Help please. Thanks, Connie

I just upgraded to Yosemite. Now when I try to open one particular document in Excel, I get a message that there's not enough memory. I can open other documents. The document I can't get to is the spreadsheet of my passwords. Go figure. When I check the storage under "about this Mac" it says I have 150 GB of 249 GB. I have a MacBook Air. Help please. Thanks, Connie

"Firefox works fine till one day when i open it up it tells me " downloading updates will open soon" IT DON'T. and when I try to open it I get "error message OXC 0000056 "

this happened every 2 or 3 days for about 2 weeks , When I reinstall the program it works ok. I have a 2010 HP with windows 7 64 bit.

That means you need to clean reinstall.
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems?esab=a&s=troubleshooting&r=3&as=s#w_5-reinstall-firefox here].
Please report back to see if this helped you!
Thank you.

I downloaded the latest version of iTunes and when I try to open it I get a message saying that my library is created in a newer version.

Has anybody else experienced this problem and can anybody suggest a way around this?

Uninstall all components, delete the named folders and reboot as set out in the second box of Troubleshooting issues with iTunes for Windows updates then reinstall.
tt2

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Firefox 3.6.x is the last available from Mozilla for PPC Macs. <br />
http://www.mozilla.com/en-US/firefox/all-older.html
For older Macs that aren't supported in Firefox 4+ versions, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . <br />
http://www.floodgap.com/software/tenfourfox/<br />
http://tenfourfox.blogspot.com/ <br />
https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported

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See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]
See also:
* http://kb.mozillazine.org/Firefox_crashes

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I just want to download Firefox 3.6 again
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Use Tony's suggestion. I am running it right now and it is awesome. I love Mozilla but they basically screwed all of those older Macs over. Come on Mozilla. These Macs still work, and there are plenty of people with them out there.

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I just upgraded to Firefox 4 and when I try to open it I get a message Cannot use with this version of OS X. How do I go back to the old version?

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