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Why do I get "The update could not be installed. Please make sure there are no other copies of Firefox running on your computer, and then restart Firefox to try again." when loading Firefox with no explanation as to what is causing the problem?

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When I load Firefox (since an upgrade to 3.6) I get error messages before it starts stating the quote above. The message does not specify which update and so when stability problems arose I stopped using Firefox in preference for another browser. I also get a message prompting me about Java which doesn't happen with any other browser. If I cannot get rid of these messages then I will continue to prefer other browsers.

When I load Firefox (since an upgrade to 3.6) I get error messages before it starts stating the quote above. The message does not specify which update and so when stability problems arose I stopped using Firefox in preference for another browser. I also get a message prompting me about Java which doesn't happen with any other browser. If I cannot get rid of these messages then I will continue to prefer other browsers.

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Why are you not using latest firefox 7?

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After writing my query I upgraded to the latest version which has, for the time being, not had the same stability problems or error messages that I experienced with the previous version,

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Issue resolved or not?

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No, if I used the version of Firefox that I had then not only did I have the problem that I described but also it crashed regularly.

As I said, the latest version does not appear to have these problems so with any luck I will be able to say that the upgrade has resolved the issues but it is too soon to be sure.