Firefox 4.0 will not work

I had Firefox 3.6. I tried to download Firefox 4.0. After the download, I received an error message that Firefox could not run on Mac OSX

Hi
I would strongly recommend you make sure that you are running the most up to date version of Firefox. This [https://support.mozilla.org/en-US/kb/update-firefox-latest-version link] will show you how.
With regards to Dashlane, the support page for that product gives some guidance that will help you to make sure that it is working properly ([http://support.dashlane.com/hc/en-us/articles/202637722-How-to-install-Dashlane-on-Windows link]).
I hope this helps, but if not please come back here and we will see what we can do.

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