When I try to download the new firefox the box that pops up says "you have chosed to open Firefox setup 4.0... etc. then it only has an option to save file or cancel. There's no option to "run" or "open"... ??

I can't seem to download the new version

Click on Save File. Then click on the Tools menu at the top of the page and click on Downloads. When the file finishes downloading, double click it to being the installation.

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