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When I am attaching documents to a new e-mail I am getting Data Execution Prevention error and crashing firefox? What can I do to overcome this problem.

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When I am making a new e-mail and trying to attach a document(Word, Wordperfect or pdf file, an error occures because of the Data Execution Prevention and crashes the program? What need to be done to correct this issue. I was able to do this a few weeks ago with no problem.

When I am making a new e-mail and trying to attach a document(Word, Wordperfect or pdf file, an error occures because of the Data Execution Prevention and crashes the program? What need to be done to correct this issue. I was able to do this a few weeks ago with no problem.

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DEP errors can be caused by plugins (Tools > Add-ons > Plugins) that aren't working properly.