User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6) Gecko/20040206 Firefox/0.8 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6) Gecko/20040206 Firefox/0.8 I have Adobe Acrobat Reader 6.0 installed and when I want to close a PDF File, Firefox freezes for 20-30 secs and doesn't respond anymore. This happens if I open a PDF in a tab and/or in a new browser window. Reproducible: Always Steps to Reproduce: 1. have Acrobat 6.0 installed 2. open a PDF File 3. close the PDF File Actual Results: Firefox freezes for 20-30 secs Expected Results: Firefox closes the PDF File and should react/work normally.

This is probably a dupe of bug 221963 Reporter, have you tried it with upgrading to version 6.01 of Adobe Reader. See the 5th comment of bug 221963. It don't get freezes (anymore) with Adobe Reader 6.0.1

Indeed, upgrading to 6.0.1 fixed this bug. Sorry I haven't read the other bugreport but my browser didn't crash but just freezed. Thanks. *** This bug has been marked as a duplicate of 221963 ***