I was prompted to download 4.0 but I keep getting an error msg: ... cannot open because it is not supported on this architecture. Downloaded it again. Same problem. I'm on a Mac.

Why I do the downlaod the firefox icon comes up with a big white circle that has a line thru it.

http://www.mozilla.com/en-US/firefox/4.0/system-requirements/
Mac
Operating Systems
* Mac OS X 10.5
* Mac OS X 10.6
Recommended Hardware
* Macintosh computer with an Intel x86 processor
* 512 MB of RAM
* 200 MB hard drive space
For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 . <br />
http://www.floodgap.com/software/tenfourfox/
Or revert to Firefox 3.6.16, which is available here: <br />
http://www.mozilla.com/en-US/firefox/all-older.html

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    *Developer's blog: http://tenfourfox.blogspot.com/
    *'''''VERY IMPORTANT'''''; '''read this carefully''': https://code.google.com/p/tenfourfox/wiki/ReleaseNotes90
    *'''''VERY IMPORTANT'''''; '''read this carefully''': https://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported
    '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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