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Why can't I open zip-files using Firefox?

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Every time I try to open a zip-file using Firefox all it does is open new tabs. I end up with dozens, sometimes hundreds, of open tabs that have nothing on the pages and the file never gets opened. Why does this happen? Is there a way to fix it and if so, how?

Every time I try to open a zip-file using Firefox all it does is open new tabs. I end up with dozens, sometimes hundreds, of open tabs that have nothing on the pages and the file never gets opened. Why does this happen? Is there a way to fix it and if so, how?

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http://support.mozilla.com/en-US/kb/Managing+file+types

Set Adobe Acrobat to handle PDF files, not Firefox.