I cannot override my previous version of Firefox with v4.0. When I try to drag it into applications, I get a message that there is a newer version already there (not true).

I have been following the download instructions. But I never get a prompt to place the file into the Applications folder. So I open the file, drag it to Applications, and get a message that I already have a newer file in Applications. However, this is not true. When I drag the file to the Firefox icon, I am told that can't be done because Firefox is already open.
I have done several other updates, never had this problem before. I have a MacBook.

Beginning with Firefox 4, Macs must have an Intel x86 processor; your system is a PPC Mac.
*System Requirements: [https://www.mozilla.org/en-US/firefox/4.0/system-requirements/index.html Firefox 4] [https://www.mozilla.org/en-US/firefox/5.0/system-requirements/index.html Firefox 5] [https://www.mozilla.org/en-US/firefox/6.0/system-requirements/index.html Firefox 6] [https://www.mozilla.org/en-US/firefox/7.0/system-requirements/index.html Firefox 7] [https://www.mozilla.org/en-US/firefox/8.0/system-requirements/index.html Firefox 8]
The good news is that Firefox 3.6.24 still supports the PPC Mac architecture. The bad news is that support for the Firefox 3.6.x series is likely to end in the first quarter of 2012.
*System requirements: [https://www.mozilla.org/en-US/firefox/3.6/system-requirements/index.html Firefox 3.6.x]
*Download Firefox 3.6.24: https://www.mozilla.org/en-US/firefox/all-older.html
You can try the third-party product '''''TenFourFox''''' that supports PPC Macs. Firefox 8 version of '''''TenFourFox''''' is available. The product is based on Firefox released versions. All support is provided by the developer, not by this site:
*Home page: http://www.floodgap.com/software/tenfourfox/
*Developer's blog: http://tenfourfox.blogspot.com/
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