Firefox 4 won't start on Mac OS X 10.4.11.

I get an error message from Firefox 4, saying it won't run on this level of operating system.
CPU 2 GHz Intel Core 2 Duo.
I had to go back to 3.16

Firefox 4 requires at least OS X 10.5 and an Intel Mac.
* http://www.mozilla.com/firefox/4.0/system-requirements/
For an unofficial Firefox 4 compatible version that runs on Mac OS X 10.4.11 or Mac OS X 10.5.8 (PowerPC) you can look at:
* http://www.floodgap.com/software/tenfourfox/
Firefox 3.6.x (Mac OS X 10.4 and later) can be found here:
* http://www.mozilla.com/en-US/firefox/all-older.html

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Firefox browser won't start or open & keep crashing on desktop

Today I got a strange problem which is kind of strange to my, so some of the details and what happened? It was just shut down the Firefox browser and trying to open it again but i got a crash pop-up message !
Not only this, but that the crash message keep pop-up, which compelled me to send a first report, the second report, etc. a lot of reporting and the problem is still there! So I then tried to fix the Firefox browser by clicking on the re-start Firefox and even reset Firefox but this did not work \\!
So right now I use Chrome browser in order to report the problem
Firefox browser won’t start or open & keep crashing on desktop :)

We're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash IDs to help us learn more about your crash.
#Enter ''about:crashes'' in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
#Copy the '''5''' most recent Report IDs that start with '''bp-''' and then go back to your forum question and paste that into the "Post a Reply" box. (Please don't take a screenshot of your crashes, just copy and paste the ID's. The below image is just an example of what your Firefox screen should look like)
[[Image:aboutcrashesFx29|width=520]]
<br><br>
Thank you for your help!
More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.

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As you can read above, that's it. The only thing I can think of is that I did a Microsoft update and then my Firefox stopped working. It won't start up. Windows and tabs won't open. It's completely unresponsive. I have uninstalled and reinstalled new and old Firefox, yet I have the same problem.

See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox

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We downloaded firefox 5.0.1 last night, began working with it. It did fine. After about an hour, I turned off my computer. When I turned on my computer, I click on Mozilla Firefox and it won't start. I get this error message, " Error: Platform version '5.0' is not compatible with minVersion >=5.0.1 maxVersion <=5.0.1" from XUL Runner. What do I need to do to fix it?

The updater wasn't able to update all the files and some were left as older versions.<br />
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* Firefox 5.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version.
* Do not remove personal data when you uninstall the current version.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
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* http://kb.mozillazine.org/Profile_folder_-_Firefox
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Hi-
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I am having similar problems to those described above. I have Master Collection CS5.5 on a Mac running OS 10.6.8. The full suite had been running fine until late October, at which point After Effects stopped loading on launch. Illustrator and Photoshop start and run without problems, but After Effects will/would not launch. It hangs while loading MediaCore. When I launch in safe mode, I get an error with the Verdana font, so I've addressed that problem as suggested above (see my notes below). I successfully launched After Effects one time last week before uninstalling the Master Collection and taking all the steps outlined below, but the software has since refused to launch at all. I have not made any major system changes in the past two months. The most recent change I've made that might be relevant is the installation of FinalCut Pro, but the two packages have coexisted without incident since summer. I regularly use VLC, Quicktime Pro 10 and Quicktime Pro 7, but I have not made any changes to these recently.
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completely uninstall and reinstall Master Collection and install software updates using "Updates" within Photoshop (have done this sequence three times)
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Hi,
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If you manage to boot OS X, uninstall Avast. Its effect on a Mac has progressed from complete and utter worthlessness to maliciousness.
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Edited because I evidently can't type in English.
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Message was edited by: Kittenmommy

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Firefox 4 won't start on Mac OS X 10.4.11.

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